Domain names, explained simply.
New to domains? Start with the basics, then explore the endings like .com, .org, .ai and country codes. Search by extension, meaning or place.
1. What is a domain name?
A domain name is the easy-to-remember address people type to find a website, like example.com. Computers use the Domain Name System (DNS) to connect that name with the services that run the website.
A domain is not the website itself. You register the name, set up DNS, and connect it to web hosting or another service.
Subdomain
Registered name
Extension / TLD
The full domain is example.com. “www” is an optional subdomain.
Domain
Your site's memorable address, such as example.com.
DNS
Records that direct browsers, email and other services to the right destination.
TLD / Extension
The ending after the last dot, such as .com, .fr, .app or .org.
2. How domain names work
Pick a short, clear name people can spell.
Use a registrar, if the name is available and you're eligible.
Point the domain to your website, email or app.
Renew registration and manage security settings.
3. Domain extension explorer
Search alphabetically or by subject. Select any extension to read its meaning and typical use.
4. Main types of domain extensions
Generic TLDs (gTLDs)
For topics and general uses: .com, .org, .shop, .blog, .tech. A name's theme is a suggestion, not a guarantee about the website.
Country-code TLDs (ccTLDs)
Often two letters linked to a country or territory: .fr, .uk, .jp, .in. Some, such as .ai and .io, are marketed globally.
Sponsored or restricted TLDs
Examples include .edu, .gov, .aero, .museum. Eligibility depends on registry policy; not everyone can register them.
Brand and infrastructure TLDs
Some companies operate their own ending, like .google. .arpa is for internet infrastructure, not a website brand.
5. A short history of domain names
The Domain Name System (DNS) is described in foundational internet specifications.
Early .com registrations help establish domain names for public use.
ICANN is established to coordinate internet identifiers.
Many new descriptive and branded TLDs join familiar endings.
6. Choosing and managing a domain
Choose well
- Keep it short, memorable and easy to say.
- Prefer clear spelling over clever punctuation.
- Check brands, trademarks and possible confusion.
- Compare first-year and renewal prices.
- Verify eligibility, transfer rules and restrictions.
Protect and maintain it
- Enable registrar account multi-factor authentication.
- Consider DNSSEC where available.
- Keep email and recovery information current.
- Use HTTPS and keep your website security updated.
- Watch expiration dates and auto-renew settings.
7. Understanding every part of a web address
A domain is only one part of a complete web address. Knowing the difference helps you recognize legitimate-looking URLs, configure a website correctly, and avoid buying services you do not need.
Example for learning only — the labels identify different parts of a URL.
Protocol: https://
The protocol tells your browser how to communicate with the website. HTTPS encrypts traffic between the browser and server, but a secure connection alone does not prove that a business is trustworthy.
Subdomain: shop
A subdomain is a name placed before the main domain. Websites often use blog.example.com, mail.example.com or shop.example.com for separate services.
Name and extension: example.com
In this example, example is the registered label and .com is its top-level domain (TLD). Some registries use additional levels, such as example.co.uk.
Path: /products
The path points to a particular page or resource on a website. Changing a path is different from registering a new domain. Query parameters and page fragments may appear after it.
8. DNS records, email and website connections
Registering a domain does not automatically create a website or professional email account. DNS records tell other computers where those services live. Most people manage them in a simple dashboard provided by their domain or DNS service.
A and AAAA records
Connect a hostname to an IPv4 or IPv6 address. These records commonly direct visitors to the server hosting a website.
CNAME records
Make one hostname an alias of another hostname. Common examples include connecting www or a service-specific subdomain.
MX records
Specify which mail servers receive messages for addresses at your domain. A website can work while email is misconfigured, or vice versa.
TXT records
Store text-based verification and policy information. They are often used for SPF, DKIM-related keys and DMARC email authentication.
NS records
Identify the authoritative name servers for a domain or delegated zone. Changing these can move DNS management to another provider.
CAA and DNSSEC
CAA can limit which certificate authorities may issue certificates for a name. DNSSEC helps validate the authenticity of DNS answers when correctly deployed.
9. Domain costs, ownership and long-term planning
A domain is generally registered for a term and renewed to keep using it; paying a fee does not mean you own its extension permanently. Plan beyond the first year so your address remains dependable as your website, business or personal project grows.
What affects domain pricing?
Prices depend on the extension, the registrar, registration term, and whether a particular name is considered premium. Some domains have introductory offers followed by higher renewal prices. Transfers, redemption after expiration, or optional privacy services may also add costs.
Compare the renewal price, not just the discounted first year. Check whether auto-renewal is enabled and whether a transfer is possible under the registry's rules.
Who controls a domain?
The registrant is the person or organization recorded as holding the domain's registration rights. A registrar manages the registration process; the registry operates the extension. Hosting and DNS may be provided by entirely different companies.
Keep the registrar login, recovery email and payment details under your control. If someone else manages your site, set clear permissions so a contractor does not become the only person able to renew or transfer your address.
What happens when a domain expires?
An expired domain may stop resolving and can eventually become available for someone else to register. Grace, redemption and deletion periods vary by extension and registrar. Restoring an expired registration may cost more than renewing it on time.
Can you move a domain?
Many domains can be transferred between registrars, subject to eligibility, locks, timing rules and authorization steps. Moving the registration is not always the same thing as moving hosting or DNS; plan changes carefully to avoid downtime.
10. Frequently asked questions
Is .com better than other extensions?
.com is familiar and widely recognized, but the best choice depends on your audience, available name, cost, and registration policies. Other extensions can work equally well for the right use.
Are domains and hosting the same thing?
No. A domain is an address. Hosting is the service that stores and delivers a website. You connect them through DNS.
Can anyone buy any extension?
No. Some TLDs have eligibility restrictions, and individual domains may be reserved, already registered or unavailable. Always verify with the relevant registry or an accredited registrar.
What is the difference between .co.uk and .uk?
.uk is the top-level domain. .co.uk is a naming structure beneath .uk commonly used for commercial domains. Some countries offer several such second-level categories.
Does an extension reveal whether a website is safe?
No. The extension alone does not establish legitimacy or safety. Check the actual organization, site content, URL and security practices.
What are IDNs and punycode?
Internationalized domain names can use non-ASCII writing systems. Their DNS-compatible form commonly begins with xn-- (called an A-label or punycode encoding).
Does searching here check if a domain is available?
No. This directory explains top-level extensions. It does not query registrar inventories, live registration or domain prices.
How can I confirm that an extension is currently active?
Check the current root-zone records and the extension’s registry policies. This guide is educational and does not provide live delegation or availability data.