Domain Name
A domain name is the human-readable web address users type into a browser to visit a website, like google.com or atomicglue.com. It maps to a numerical IP address that computers use to find each other on the internet.
§ 1 Definition
A domain name is a unique, human-readable label that identifies a specific resource on the internet, most commonly a website. It serves as the user-friendly alternative to an IP address (a string of numbers like 192.0.2.1). Domain names are organized in a hierarchical structure, read from right to left. A complete domain name like www.example.com is called a Fully Qualified Domain Name (FQDN). Domain names are managed by the Domain Name System (DNS), which translates them into IP addresses so browsers can load internet resources. They must be registered through accredited registrars and are leased on a renewable basis.
§ 2 How Domain Names Work
When you type a domain name into a browser, the DNS resolver kicks off a lookup chain. It first queries the root DNS servers, then the TLD servers (like those for .com or .org), and finally the authoritative nameservers for that specific domain. The result is the IP address of the server hosting the website. This process, called DNS resolution, happens in milliseconds. Every domain name must be unique, no two entities can hold the exact same domain. The Domain Name System is a distributed database, designed to be resilient and avoid a single point of failure.
§ 3 Parts of a Domain Name
A domain name is broken into three main parts: * TLD (Top-Level Domain): The rightmost segment, such as .com, .org, .net. This is the broadest category. * Second-Level Domain (SLD): The part immediately to the left of the TLD that you register, like "atomicglue" in atomicglue.com. This is the unique identifier for your brand. * Subdomain: The optional leftmost part, like "www" or "blog". It points to a specific section or service under the main domain.
§ 4 Registration and Renewal
Domain names are not purchased outright; they are leased from a registrar for a set period (typically 1 to 10 years). You must renew your registration before it expires, or the domain becomes available for others to register. ICANN (Internet Corporation for Assigned Names and Numbers) oversees the domain name system globally. Domain squatting (registering domains in bad faith) can be contested through ICANN's Uniform Domain-Name Dispute-Resolution Policy (UDRP).
§ 5 Common questions
- Q. Can I buy a domain name forever?
- A. No. Domain names are leased, not owned. You register them for a fixed term and must renew. Some registrars offer auto-renewal to prevent accidental expiration.
- Q. What happens if my domain expires?
- A. Most registrars have a grace period (usually 30 days) where you can still renew. After that, the domain enters a redemption period and may be auctioned or released to the public.
- Q. What is the difference between a domain name and a URL?
- A. A domain name is part of a URL. For example, in https://www.atomicglue.com/services, the domain name is atomicglue.com, while the full URL includes the protocol and path.
- Domain names are human-friendly aliases for IP addresses, managed through the DNS system.
- They are structured hierarchically: subdomain, second-level domain, and TLD.
- Domains are leased from registrars and must be renewed periodically.
- Choosing a strong domain name is critical for brand identity and SEO.
We register, configure, and manage domain names for clients as part of our Web Development services. Let us handle the technical setup so you can focus on your business. Get in touch to discuss your domain strategy.
Get in touchA domain name is the human-readable web address users type into a browser to visit a website, like google.com or atomicglue.com. It maps to a numerical IP address that computers use to find each other on the internet.
Category: General (also: Front End, Infrastructure)
Author: Atomic Glue Technical Team
## Definition
A domain name is a unique, human-readable label that identifies a specific resource on the internet, most commonly a website. It serves as the user-friendly alternative to an IP address (a string of numbers like 192.0.2.1). Domain names are organized in a hierarchical structure, read from right to left. A complete domain name like www.example.com is called a Fully Qualified Domain Name (FQDN). Domain names are managed by the Domain Name System (DNS), which translates them into IP addresses so browsers can load internet resources. They must be registered through accredited registrars and are leased on a renewable basis.
## How Domain Names Work
When you type a domain name into a browser, the DNS resolver kicks off a lookup chain. It first queries the root DNS servers, then the TLD servers (like those for .com or .org), and finally the authoritative nameservers for that specific domain. The result is the IP address of the server hosting the website. This process, called DNS resolution, happens in milliseconds. Every domain name must be unique, no two entities can hold the exact same domain. The Domain Name System is a distributed database, designed to be resilient and avoid a single point of failure.
## Parts of a Domain Name
A domain name is broken into three main parts: * **TLD (Top-Level Domain):** The rightmost segment, such as .com, .org, .net. This is the broadest category. * **Second-Level Domain (SLD):** The part immediately to the left of the TLD that you register, like "atomicglue" in atomicglue.com. This is the unique identifier for your brand. * **Subdomain:** The optional leftmost part, like "www" or "blog". It points to a specific section or service under the main domain.
## Registration and Renewal
Domain names are not purchased outright; they are leased from a registrar for a set period (typically 1 to 10 years). You must renew your registration before it expires, or the domain becomes available for others to register. ICANN (Internet Corporation for Assigned Names and Numbers) oversees the domain name system globally. Domain squatting (registering domains in bad faith) can be contested through ICANN's Uniform Domain-Name Dispute-Resolution Policy (UDRP).
## Common questions
Q: Can I buy a domain name forever?
A: No. Domain names are leased, not owned. You register them for a fixed term and must renew. Some registrars offer auto-renewal to prevent accidental expiration.
Q: What happens if my domain expires?
A: Most registrars have a grace period (usually 30 days) where you can still renew. After that, the domain enters a redemption period and may be auctioned or released to the public.
Q: What is the difference between a domain name and a URL?
A: A domain name is part of a URL. For example, in https://www.atomicglue.com/services, the domain name is atomicglue.com, while the full URL includes the protocol and path.
## Key takeaways
- Domain names are human-friendly aliases for IP addresses, managed through the DNS system.
- They are structured hierarchically: subdomain, second-level domain, and TLD.
- Domains are leased from registrars and must be renewed periodically.
- Choosing a strong domain name is critical for brand identity and SEO.
## Related entries
- [Subdomain](atomicglue.co/glossary/subdomain)
- [TLD (Top-Level Domain)](atomicglue.co/glossary/tld)
- [ccTLD (Country Code TLD)](atomicglue.co/glossary/cctld)
Last updated July 2025. Permalink: atomicglue.co/glossary/domain-name