Resource Library
Hosting Glossary
Every bit of hosting jargon, decoded into ordinary English here. 100 in-depth guides, updated for 2026.
100 Pages
Every glossary guide, in one place
.htaccess
.htaccess is Apache's per-directory configuration file.
Read guide301 Redirect
A 301 redirect permanently forwards one URL to another, sending visitors along and transferring search-ranking signals to the destination.
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 holds your website.
Read guideAddon Domain
An addon domain is a second, fully independent website hosted on the same hosting account.
Read guideApache
Apache is the veteran open-source web server whose conventions — .htaccess above all — shaped how shared hosting works to this day.
Read guideAPI (Application Programming Interface)
An API is a defined way for software to talk to software.
Read guideAutoresponder
An autoresponder is an automatic reply sent to anyone emailing an address.
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.
Read guideBrute-Force Attack
A brute-force attack tries credentials repeatedly — passwords guessed by the thousand, or leaked pairs replayed.
Read guideCache
A cache stores the results of expensive work for instant reuse.
Read guideCatch-All Email
A catch-all accepts mail sent to any address at your domain.
Read guideccTLD (Country Code TLD)
A ccTLD is a two-letter country-specific domain extension — .uk, .de, .fr.
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 your origin.
Read guideCloud Hosting
Cloud hosting runs websites across pooled, virtualised infrastructure billed by usage, prioritising elasticity over fixed capacity.
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.
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.
Read guideCron Job
A cron job is a scheduled command the server runs automatically.
Read guideCross-Site Scripting (XSS)
XSS plants attacker-controlled script into pages other visitors view.
Read guideDatabase
A database is structured storage that applications query.
Read guideDDoS Attack
A DDoS attack floods a target with traffic from many sources at once, aiming to exhaust its capacity and knock it offline.
Read guideDedicated Server
A dedicated server is an entire physical machine rented to one customer — every core, byte and disk answering to a single tenant.
Read guideDirectAdmin
DirectAdmin is a lean hosting control panel prized for speed, simplicity and licensing costs that keep reseller margins healthy.
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 transit.
Read guideDMARC
DMARC is the policy layer over SPF and DKIM — telling receivers what to do with mail that fails authentication, and reporting what they saw.
Read guideDNS (Domain Name System)
DNS is the internet's directory service, translating human-readable domain names into the numeric addresses and routing instructions machines require.
Read guideDNS Propagation
DNS propagation is the period during which cached old answers expire across the world's resolvers after you change a record.
Read guideDocument Root
The document root is the folder on the server that a domain's URLs map into.
Read guideDomain Name
A domain name is the human-readable address of a website.
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.
Read guideEmail Forwarder
An email forwarder redirects mail from one address to another — role addresses routed to real mailboxes without extra passwords.
Read guideEncryption
Encryption scrambles data so only holders of the right key can read it.
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 rest by default.
Read guideFTP
FTP is the veteran file-transfer protocol for moving files between your computer and a server.
Read guideGit
Git is the version-control system that records every change to a codebase.
Read guideHTTP Status Codes
HTTP status codes are the three-digit results servers attach to every response.
Read guideHTTPS
HTTPS is HTTP over an encrypted connection — the web's standard transport, protecting everything between browser and server from reading or tampering.
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.
Read guideIP Address
An IP address is the numeric identifier that locates a machine on a network — the actual destination behind every domain name.
Read guideIPv6
IPv6 is the successor addressing system with a practically inexhaustible address space, running alongside the exhausted IPv4 internet.
Read guideLazy Loading
Lazy loading defers offscreen images and embeds until the visitor scrolls toward them — first paint stops paying for the footer.
Read guideLet's Encrypt
Let's Encrypt is the free, automated certificate authority that made HTTPS universal.
Read guideLiteSpeed
LiteSpeed is a high-performance web server with Apache compatibility and built-in caching — the engine behind our hosting's speed.
Read guideMailbox Quota
A mailbox quota is the storage ceiling for one email account — and a full mailbox silently bounces new mail back to its senders.
Read guideMalware
Website malware is hostile code planted on a compromised site.
Read guideManaged Hosting
Managed hosting bundles the operational care of your platform — updates, security, backups, tuning — into the hosting service itself.
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.
Read guideNameserver
Nameservers are the servers authorised to answer DNS queries for your domain.
Read guideNginx
Nginx is the event-driven web server built for high concurrency.
Read guideNVMe
NVMe is flash storage attached over PCIe with a protocol built for it — dramatically faster and more parallel than SATA-era SSDs.
Read guideOPcache
OPcache keeps compiled PHP bytecode in memory, so scripts skip recompilation on every request — free speed for every PHP site.
Read guideParked Domain
A parked domain is a registered domain pointed at your hosting without its own site.
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.
Read guidePlesk
Plesk is a major hosting control panel known for its clean interface and rare distinction of running on both Linux and Windows servers.
Read guidePlugin
A plugin is an installable extension that adds functionality to a platform.
Read guidePOP3
POP3 is the veteran email protocol that downloads messages to one device — traditionally deleting them from the server as it goes.
Read guideRedis
Redis is an in-memory data store used as an object cache — holding query results and computed data at memory speed for reuse.
Read guideReseller Hosting
Reseller hosting lets you buy hosting capacity wholesale and sell it under your own brand, with tools to create and manage isolated customer accounts.
Read guideSFTP
SFTP is secure file transfer over the SSH protocol.
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 applications with their databases and configuration handled automatically.
Read guideSpam Filter
A spam filter scores incoming mail against patterns, reputation and authentication, diverting the junk before it reaches your inbox.
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 senders.
Read guideSQL Injection
SQL injection smuggles database commands through input fields.
Read guideSSD
An SSD stores data in flash memory with no moving parts — the storage generation that retired spinning drives from serious hosting.
Read guideSSH (Secure Shell)
SSH is the encrypted protocol for operating a server through a terminal.
Read guideSSL Certificate
An SSL certificate is the credential that enables encrypted HTTPS connections and vouches that the server holds the domain it claims.
Read guideSSL Validation Levels (DV, OV, EV)
SSL validation levels describe how deeply the certificate authority vetted the applicant.
Read guideStaging Environment
A staging environment is a private copy of your live site where changes are rehearsed before the audience ever sees them.
Read guideSubdomain
A subdomain is a named subdivision of your domain — blog.example.com, shop.example.com.
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 govern the name.
Read guideTLS (Transport Layer Security)
TLS is the cryptographic protocol actually securing HTTPS connections.
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 perceived speed.
Read guideTTL (Time To Live)
TTL is how long DNS resolvers may cache a record's answer before asking again.
Read guideTwo-Factor Authentication (2FA)
2FA requires a second proof beyond the password — typically a time-based app code.
Read guideTXT Record
A TXT record stores arbitrary text in your DNS zone — the mechanism behind domain verifications, SPF policies and DKIM keys.
Read guideUptime
Uptime is the percentage of time a hosting service is reachable.
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 fraction of a whole server's price.
Read guideWAF (Web Application Firewall)
A WAF inspects web requests for attack patterns — SQL injection, script injection, known exploit probes.
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 visits its address.
Read guideWebhook
A webhook is an API call in reverse — a service pushes a notification to your URL the moment something happens, instead of you polling to ask.
Read guideWebmail
Webmail is your mailbox in a browser — no client configuration, just a login from any device to the same server-side mail.
Read guideWHM (WebHost Manager)
WHM is the administrative layer above cPanel — the interface where resellers and server owners create accounts, set plans and manage the platform.
Read guideWHMCS
WHMCS is the hosting industry's standard billing and automation platform.
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 credential.
Read guideWooCommerce
WooCommerce is the open-source plugin that turns WordPress into a full online store.
Read guideWordPress
WordPress is the open-source content management system running roughly four in ten websites.
Read guideFound what you needed?
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