Domain Names and URLs: Understanding Website Addresses Before Launch

Before you publish your first website, you will encounter two terms that are often used interchangeably but mean different things: domain name and URL. Knowing what each part of a web address does helps you set up your site correctly, communicate your address to visitors, and troubleshoot problems when something does not load as expected.

Reading a Complete Web Address

Suppose you are building a hypothetical personal site about container gardening and you plan to publish it at the following address: https://mysmallgarden.example.com/tips/soil-prep?season=spring#tools. This is not a real site; it is a constructed example used to practice reading each component. The first segment, https://, is the scheme and tells the browser which protocol to use when requesting the page. The next segment, mysmallgarden.example.com, is the domain name that identifies the specific server hosting your content. The portion after the domain, /tips/soil-prep, is the path pointing to a particular resource on that server. The question mark introduces query parameters, so season=spring passes extra information to the server. Finally, the hash symbol followed by tools is an anchor that directs the browser to a specific section within the page itself.¹

Notice that the domain name is only one piece of the full URL. If you share just mysmallgarden.example.com with someone, they will reach your homepage or default page, but they will not land directly on the soil preparation article. Understanding this distinction matters when you write links in emails, social media posts, or printed materials, because each level of specificity serves a different purpose.¹

Write down the address of any page you plan to promote before launch and break it into these same segments. Identifying the scheme, domain, path, parameters, and anchor separately makes it easier to spot errors such as a missing slash, a misspelled label, or an unintended query string that could confuse visitors or break the link.

What a Domain Name Actually Is

A domain name is a human-readable address that points to a web server on the Internet. Every connected computer can be reached through a numeric IP address, such as an IPv4 address like 192.0.2.172 or an IPv6 address like 2001:db8:8b73:0000:0000:8a2e:0370:1337. Computers handle these numbers easily, but people find them difficult to remember and they can change over time. Domain names solve this problem by providing a memorable label that the DNS system translates into the correct IP address behind the scenes.²³

A domain name has a hierarchical structure made of labels separated by dots, read from right to left. The rightmost label is the top-level domain, or TLD, which indicates the general category of the service. The label immediately to its left is often called the second-level domain, and additional labels to the left create subdomains. For example, in developer.mozilla.org, org is the TLD, mozilla.org is the second-level domain, and developer is a subdomain. All together these form a fully qualified domain name.²⁴

You do not buy a domain name outright. Instead, you pay for the right to use it for a set period, and your renewal takes priority over other applications. Companies called registrars maintain the technical and administrative records that connect you to your domain. This arrangement ensures that unused names eventually become available again rather than being locked permanently.²

Top-Level Domains and What They Signal

The most common generic TLDs such as .com, .org, and .net do not require a website to meet any particular criteria. Other TLDs enforce stricter policies. Local TLDs like .us, .fr, or .se can indicate that a resource is associated with a particular language or country. The .gov TLD is restricted to government departments, and .edu is limited to educational and academic institutions. ICANN maintains the full list of TLDs and designates organizations to manage each one.²⁴

IANA distinguishes several groups of top-level domains. Country-code top-level domains are two-character domains established for countries or territories, such as .us for the United States. Generic top-level domains have three or more characters and include both unsponsored domains that operate under ICANN policies and sponsored domains proposed by private organizations that set their own eligibility rules. Knowing these categories helps you understand why some suffixes are open to anyone while others carry restrictions.⁴

For a first personal project, the choice of TLD is primarily a matter of availability and the impression you want to give visitors. A generic suffix like .com carries no special requirement and is widely recognized. If your project is tied to a specific country or community, a country-code TLD may communicate that association more clearly. Record the reasoning behind your choice so you can explain it if someone asks why you selected a particular suffix.

How the Parts of a URL Work Together

A URL is the complete address of a unique resource on the Internet and is one of the key mechanisms browsers use to retrieve published resources such as HTML pages, CSS documents, and images. In theory each valid URL points to a unique resource, though in practice a URL may point to a resource that no longer exists or has moved. The most important mandatory parts are the scheme and the authority, which together tell the browser where to go and how to communicate.¹

The authority section includes the domain name and optionally a port number. The port is usually omitted because standard web servers use well-known ports: 80 for HTTP and 443 for HTTPS. After the authority comes the path, which identifies a specific resource on the server. In the early days of the web, a path represented a physical file location, but today it is mostly an abstraction handled by web servers without any physical reality. Parameters follow the path and provide key-value pairs separated by ampersands, allowing the server to perform additional processing before returning the resource.¹

The anchor, also called a fragment identifier, points to a location within the resource itself rather than to a separate file. On an HTML document the browser scrolls to the point where the anchor is defined. It is worth noting that the fragment portion is never sent to the server with the request; it is handled entirely by the browser on the client side. This distinction becomes relevant if you ever debug why a shared link opens the correct page but does not scroll to the expected section.¹

Preparing Your Address Before You Go Live

Check the spelling of your desired domain name carefully before you submit any registration form. Domain labels are case-insensitive but they can only contain letters A through Z, digits 0 through 9, and the hyphen character, which may not appear as the first or last character in a label. A label can be anywhere from one to sixty-three characters in length. Verifying these rules against your intended name prevents surprises during registration.²

Record the full URL of every page you plan to share publicly, including the scheme, domain, path, and any parameters. Keeping this list in a simple text file or note gives you a reference when you set up navigation links, write social media bios, or configure email signatures. If you later restructure your site, the list helps you identify which addresses need updating.

Use a registrar's search tool or a whois lookup to confirm whether your desired name is available before you invest time designing around it. Most registrars provide a search interface on their website, and you can also type a whois command in a system shell to check the database directly. If the lookup returns no result for the name, it is likely available for registration.²

Common Mistakes and a Final Checklist

One frequent mistake is confusing the domain name with the full URL. Sharing only the domain when you intend to direct someone to a specific page means the visitor lands on your default page instead of the content you wanted them to see. Conversely, sharing a URL that includes unnecessary parameters or anchors can make the link look cluttered and may break if the underlying page structure changes.¹

Another common issue involves misspelling labels or omitting required characters. Because a hyphen cannot start or end a label, a name like -myblog.com or myblog-.com would be invalid. Similarly, forgetting the scheme prefix when configuring certain tools or redirects can cause connection failures. Reviewing the structural rules for both domain names and URLs before launch catches these problems early.²¹

As a final step, type each address you plan to publish into a browser and confirm that it loads the expected resource. Pay attention to whether the path resolves correctly, whether query parameters produce the intended result, and whether anchors scroll to the right section. This simple verification takes only a few minutes and prevents the most common launch-day surprises related to website addresses.

Frequently asked questions

Is a domain name the same thing as a URL?

No. A domain name identifies the server, while a URL is the complete address that includes the scheme, domain, path, optional parameters, and optional anchor. The domain is one component within the full URL.²¹

Can I own a domain name permanently?

You cannot buy a domain name outright. You pay for the right to use it for a set period, and your renewal takes priority over other applications, but the name itself is never owned permanently.²

What characters are allowed in a domain label?

A label can contain only the letters A through Z, digits 0 through 9, and the hyphen character. The hyphen may not be the first or last character, and each label must be between one and sixty-three characters in length.²