Resource Library
Hosting Glossary
Hosting jargon translated into plain English, term by term. 100 in-depth guides, updated for 2026.
100 Pages
Every glossary guide, in one place
.htaccess
.htaccess is Apache's per-directory configuration file — a plain-text control surface for redirects, rewrites, securi…
Read guide301 Redirect
A 301 redirect permanently forwards one URL to another, sending visitors along and transferring search-ranking signal…
Read guide404 Error
A 404 is the server's 'not found' response — the URL was understood, but no resource lives there.
Read guideA Record
An A record maps a hostname directly to an IPv4 address — the DNS entry that tells browsers which server actually hol…
Read guideAddon Domain
An addon domain is a second, fully independent website hosted on the same hosting account — its own domain, folder an…
Read guideApache
Apache is the veteran open-source web server whose conventions — .htaccess above all — shaped how shared hosting work…
Read guideAPI (Application Programming Interface)
An API is a defined way for software to talk to software — the contract through which services exchange data and comm…
Read guideAutoresponder
An autoresponder is an automatic reply sent to anyone emailing an address — out-of-office notices and instant acknowl…
Read guideBackup
A backup is a restorable copy of your site's files and database — the difference between a disaster and an anecdote.
Read guideBandwidth
Bandwidth in hosting is the volume of data your site transfers to visitors over a billing period — every page, image …
Read guideBrute-Force Attack
A brute-force attack tries credentials repeatedly — passwords guessed by the thousand, or leaked pairs replayed — unt…
Read guideCache
A cache stores the results of expensive work for instant reuse — pages, queries and assets served from memory instead…
Read guideCatch-All Email
A catch-all accepts mail sent to any address at your domain — typos and retired addresses recovered, at the price of …
Read guideccTLD (Country Code TLD)
A ccTLD is a two-letter country-specific domain extension — .uk, .de, .fr — signalling national identity to users and…
Read guideCDN (Content Delivery Network)
A CDN caches your site's assets on servers around the world, serving each visitor from the nearest edge instead of yo…
Read guideCloud Hosting
Cloud hosting runs websites across pooled, virtualised infrastructure billed by usage, prioritising elasticity over f…
Read guideCMS (Content Management System)
A CMS is software that lets people create and manage website content through an editing interface instead of code.
Read guideCNAME Record
A CNAME record makes one hostname an alias of another — the name resolves to wherever its target currently points.
Read guideControl Panel
A control panel is the web interface through which you operate your hosting — files, databases, email, domains and se…
Read guideCore Web Vitals
Core Web Vitals are Google's user-experience metrics — loading (LCP), interactivity (INP) and visual stability (CLS) …
Read guidecPanel
cPanel is the hosting industry's most widely used control panel — the standard interface for managing sites, email, d…
Read guideCron Job
A cron job is a scheduled command the server runs automatically — the mechanism behind backups at 2am, hourly imports…
Read guideCross-Site Scripting (XSS)
XSS plants attacker-controlled script into pages other visitors view — hijacking sessions, defacing content or redire…
Read guideDatabase
A database is structured storage that applications query — the organised memory holding a site's content, users and t…
Read guideDDoS Attack
A DDoS attack floods a target with traffic from many sources at once, aiming to exhaust its capacity and knock it off…
Read guideDedicated Server
A dedicated server is an entire physical machine rented to one customer — every core, byte and disk answering to a si…
Read guideDirectAdmin
DirectAdmin is a lean hosting control panel prized for speed, simplicity and licensing costs that keep reseller margi…
Read guideDisk Space
Disk space is the storage your hosting account may use for files, databases and email combined.
Read guideDKIM (DomainKeys Identified Mail)
DKIM cryptographically signs outgoing mail so receivers can verify it came from your domain and wasn't altered in tra…
Read guideDMARC
DMARC is the policy layer over SPF and DKIM — telling receivers what to do with mail that fails authentication, and r…
Read guideDNS (Domain Name System)
DNS is the internet's directory service, translating human-readable domain names into the numeric addresses and routi…
Read guideDNS Propagation
DNS propagation is the period during which cached old answers expire across the world's resolvers after you change a …
Read guideDocument Root
The document root is the folder on the server that a domain's URLs map into — the boundary between your site's public…
Read guideDomain Name
A domain name is the human-readable address of a website — the memorable text that DNS translates into the numeric ad…
Read guideDomain Privacy
Domain privacy masks your personal registration details in public WHOIS results, substituting proxy contact information.
Read guideDomain Registrar
A registrar is the accredited company through which you register and manage domains — your interface to the registrie…
Read guideEmail Forwarder
An email forwarder redirects mail from one address to another — role addresses routed to real mailboxes without extra…
Read guideEncryption
Encryption scrambles data so only holders of the right key can read it — the mathematics beneath HTTPS, SSH, secure e…
Read guideEPP Code (Auth Code)
An EPP or auth code is the transfer password for a domain — the secret that authorises moving it between registrars.
Read guideFirewall
A firewall filters network traffic by rule — deciding which connections may reach which services, and refusing the re…
Read guideFTP
FTP is the veteran file-transfer protocol for moving files between your computer and a server — now properly used onl…
Read guideGit
Git is the version-control system that records every change to a codebase — the history, undo button and collaboratio…
Read guideHTTP Status Codes
HTTP status codes are the three-digit results servers attach to every response — 2xx success, 3xx redirection, 4xx cl…
Read guideHTTPS
HTTPS is HTTP over an encrypted connection — the web's standard transport, protecting everything between browser and …
Read guideIMAP
IMAP is the email protocol that keeps mail on the server and synchronises every device to the same mailbox state.
Read guideInode
An inode is the filesystem's record for a single file or folder — hosting plans cap inode counts, effectively limitin…
Read guideIP Address
An IP address is the numeric identifier that locates a machine on a network — the actual destination behind every dom…
Read guideIPv6
IPv6 is the successor addressing system with a practically inexhaustible address space, running alongside the exhaust…
Read guideLazy Loading
Lazy loading defers offscreen images and embeds until the visitor scrolls toward them — first paint stops paying for …
Read guideLet's Encrypt
Let's Encrypt is the free, automated certificate authority that made HTTPS universal — issuing short-lived certificat…
Read guideLiteSpeed
LiteSpeed is a high-performance web server with Apache compatibility and built-in caching — the engine behind our hos…
Read guideMailbox Quota
A mailbox quota is the storage ceiling for one email account — and a full mailbox silently bounces new mail back to i…
Read guideMalware
Website malware is hostile code planted on a compromised site — spam injections, redirects, phishing kits and backdoo…
Read guideManaged Hosting
Managed hosting bundles the operational care of your platform — updates, security, backups, tuning — into the hosting…
Read guideMX Record
An MX record declares which mail servers accept email for your domain, with priority numbers ordering delivery attempts.
Read guideMySQL
MySQL is the relational database powering most hosted applications — the structured store where WordPress keeps every…
Read guideNameserver
Nameservers are the servers authorised to answer DNS queries for your domain — whoever runs them controls where your …
Read guideNginx
Nginx is the event-driven web server built for high concurrency — serving thousands of simultaneous connections with …
Read guideNVMe
NVMe is flash storage attached over PCIe with a protocol built for it — dramatically faster and more parallel than SA…
Read guideOPcache
OPcache keeps compiled PHP bytecode in memory, so scripts skip recompilation on every request — free speed for every …
Read guideParked Domain
A parked domain is a registered domain pointed at your hosting without its own site — held in reserve, aliased to an …
Read guidePhishing
Phishing is fraud by impersonation — messages and pages mimicking trusted brands to harvest credentials and payments.
Read guidePHP
PHP is the server-side language running most of the web's dynamic sites — WordPress, WooCommerce and the bulk of the …
Read guidePlesk
Plesk is a major hosting control panel known for its clean interface and rare distinction of running on both Linux an…
Read guidePlugin
A plugin is an installable extension that adds functionality to a platform — in WordPress, everything from contact fo…
Read guidePOP3
POP3 is the veteran email protocol that downloads messages to one device — traditionally deleting them from the serve…
Read guideRedis
Redis is an in-memory data store used as an object cache — holding query results and computed data at memory speed fo…
Read guideReseller Hosting
Reseller hosting lets you buy hosting capacity wholesale and sell it under your own brand, with tools to create and m…
Read guideSFTP
SFTP is secure file transfer over the SSH protocol — encrypted end to end, using your SSH credentials, through the sa…
Read guideShared Hosting
Shared hosting places many customers' websites on one server, dividing its costs and resources among them.
Read guideSMTP
SMTP is the protocol that sends email — from your client to your mail server, and between servers across the internet.
Read guideSoftaculous
Softaculous is the one-click installer inside your control panel that deploys WordPress and hundreds of other applica…
Read guideSpam Filter
A spam filter scores incoming mail against patterns, reputation and authentication, diverting the junk before it reac…
Read guideSPF (Sender Policy Framework)
SPF is a DNS-published list of servers authorised to send email for your domain — receivers check it to spot forged s…
Read guideSQL Injection
SQL injection smuggles database commands through input fields — turning a search box or login form into a channel for…
Read guideSSD
An SSD stores data in flash memory with no moving parts — the storage generation that retired spinning drives from se…
Read guideSSH (Secure Shell)
SSH is the encrypted protocol for operating a server through a terminal — commands, file transfers and tunnels, all a…
Read guideSSL Certificate
An SSL certificate is the credential that enables encrypted HTTPS connections and vouches that the server holds the d…
Read guideSSL Validation Levels (DV, OV, EV)
SSL validation levels describe how deeply the certificate authority vetted the applicant — domain control only (DV), …
Read guideStaging Environment
A staging environment is a private copy of your live site where changes are rehearsed before the audience ever sees t…
Read guideSubdomain
A subdomain is a named subdivision of your domain — blog.example.com, shop.example.com — each able to host distinct c…
Read guideTheme
A theme is the design layer of a CMS site — templates, styles and layout decisions wrapped into an installable package.
Read guideTLD (Top-Level Domain)
A TLD is the final segment of a domain — the .com, .org or .co.uk that determines which registry's rules and prices g…
Read guideTLS (Transport Layer Security)
TLS is the cryptographic protocol actually securing HTTPS connections — the modern successor whose predecessor's name…
Read guideTTFB (Time To First Byte)
TTFB measures the delay between requesting a page and receiving its first byte — the server-and-network share of perc…
Read guideTTL (Time To Live)
TTL is how long DNS resolvers may cache a record's answer before asking again — the setting that determines how fast …
Read guideTwo-Factor Authentication (2FA)
2FA requires a second proof beyond the password — typically a time-based app code — so a stolen password alone no lon…
Read guideTXT Record
A TXT record stores arbitrary text in your DNS zone — the mechanism behind domain verifications, SPF policies and DKI…
Read guideUptime
Uptime is the percentage of time a hosting service is reachable — with each additional nine dramatically shrinking th…
Read guideVPS (Virtual Private Server)
A VPS is a virtual machine carved from a physical server, giving you dedicated resources and root access at a fractio…
Read guideWAF (Web Application Firewall)
A WAF inspects web requests for attack patterns — SQL injection, script injection, known exploit probes — and blocks …
Read guideWeb Hosting
Web hosting is the service of storing a website's files on an always-on server and delivering them to anyone who visi…
Read guideWebhook
A webhook is an API call in reverse — a service pushes a notification to your URL the moment something happens, inste…
Read guideWebmail
Webmail is your mailbox in a browser — no client configuration, just a login from any device to the same server-side …
Read guideWHM (WebHost Manager)
WHM is the administrative layer above cPanel — the interface where resellers and server owners create accounts, set p…
Read guideWHMCS
WHMCS is the hosting industry's standard billing and automation platform — running orders, invoicing, provisioning, s…
Read guideWHOIS
WHOIS is the public lookup system recording who registered a domain, through which registrar, and on what dates.
Read guideWildcard SSL
A wildcard SSL certificate secures a domain and all its first-level subdomains — *.example.com covered under one cred…
Read guideWooCommerce
WooCommerce is the open-source plugin that turns WordPress into a full online store — products, cart, checkout and or…
Read guideWordPress
WordPress is the open-source content management system running roughly four in ten websites — the default answer to '…
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