Before you publish your first website, you need to understand the address that visitors will use to find it. Domain names and URLs look similar but serve different roles, and confusing them can lead to setup mistakes. This article walks through both concepts using a clearly marked hypothetical example and gives you concrete steps to verify your own understanding.12
Reading a Website Address for the First Time
Suppose you are planning a small portfolio site and someone hands you this address: https://myportfolio.example.com/projects/design?q=recent#gallery. This is a hypothetical example, not a real site, but every piece of it follows the same rules that apply to actual websites. Reading it from left to right, you can identify several distinct components: a scheme, a domain name with a subdomain, a path, a query parameter, and an anchor. Each part tells the browser something different about where to go and what to show.12
The domain name portion here is myportfolio.example.com. The rightmost segment, .com, is the top-level domain, which signals a general-purpose registration. The segment example is the label that identifies the specific registered name, and myportfolio is a subdomain created under that name. The path /projects/design points to a particular resource on the server, the query parameter ?q=recent passes extra information, and the anchor #gallery marks a specific spot within the page. Understanding these pieces separately helps you diagnose problems when a page fails to load or displays unexpected content.12
This example illustrates a key point: a domain name is only one component of a full URL. Many beginners use the two terms interchangeably, but they refer to different things. The domain name identifies the server, while the URL identifies a specific resource on that server. Keeping this distinction clear will help you communicate more precisely with hosting providers, collaborators, and support teams as you prepare your site for launch.12
What a Domain Name Actually Is
A domain name is a human-readable address for a web server available on the internet. Computers communicate using numeric IP addresses, either IPv4 format like 192.0.2.172 or IPv6 format like 2001:db8:8b73:0000:0000:8a2e:0370:1337. People find these difficult to remember and they can change over time. Domain names solve this problem by providing a stable, memorable label that maps to the underlying numeric address.1
The structure of a domain name is straightforward. Its parts are separated by dots and read from right to left. The rightmost part is the top-level domain, or TLD, which tells users the general purpose of the service. Generic TLDs like .com, .org, and .net do not require the service to meet any particular criteria. Other TLDs enforce stricter policies: .gov is reserved for government departments, .edu for educational and academic institutions, and local TLDs like .us or .fr may indicate a resource in a particular language or country.1
The labels that follow the TLD are case-insensitive character sequences between one and sixty-three characters long. They may contain letters A through Z, digits 0 through 9, and the hyphen character, though a hyphen cannot appear as the first or last character in a label. The label immediately before the TLD is called the secondary level domain. You do not need three labels to form a valid domain name, and for any domain you control you can create subdomains with different content at each one.1
How a URL Differs from a Domain Name
A URL, short for Uniform Resource Locator, is the address of a unique resource on the internet. It 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 domain name is embedded within the URL as part of the authority section, but the URL contains additional information that the domain name alone does not provide.2
Think of the distinction this way: the domain name identifies the building, while the full URL specifies the exact room, floor, and even the desk within that building. When you type only a domain name into your browser, the browser fills in default values for the missing parts, such as the scheme and the root path. But when you share a link to a specific page, you need the complete URL so that the recipient arrives at the correct resource rather than just the site homepage.2
This distinction matters during site planning because you will often need to construct or verify full URLs for internal links, social media profiles, and external references. If you only know your domain name but not the path structure your site will use, you cannot predict what your shareable links will look like. Writing out a few example URLs for your planned pages before launch helps you confirm that the structure is logical and that visitors will be able to navigate by reading the address itself.2
The Components of a URL Explained
The first part of a URL is the scheme, which indicates the protocol the browser must use to request the resource. For websites this is typically HTTPS or its unsecured version HTTP. The scheme is followed by the authority, separated by the character pattern ://. The authority includes the domain name and optionally a port number. The port is usually omitted because web servers use the standard ports of the HTTP protocol, but it becomes mandatory when a server uses a non-standard port.2
After the authority comes the path, which identifies the specific resource on the web 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. Following the path, you may see parameters introduced by a question mark. These are key-value pairs separated by the ampersand symbol, and the web server can use them to perform additional processing before returning the resource. Finally, an anchor introduced by a hash symbol acts as a bookmark inside the resource, directing the browser to a specific location within the page.2
Write out the full URL for at least three pages you plan to publish, including the scheme, domain, path, and any parameters you expect to use. This exercise forces you to think about your site structure concretely. If your paths use meaningful words rather than random characters, they become semantic URLs that are easier for you to manage and easier for visitors to interpret. Semantic URLs use words with inherent meaning that can be understood regardless of technical knowledge, and they clarify where users are and what they are reading on your site.2
Registering and Preparing Your Domain Name
You cannot buy a domain name outright. Instead, you pay for the right to use it for one or more years, and you can renew that right with priority over other applicants. Companies called registrars use domain name registries to keep track of the technical and administrative information connecting you to your domain name. This arrangement ensures that unused names eventually become available for others to register.1
Check the availability of your desired domain name before you invest time in designing around it. Most registrar websites provide a search or whois service that tells you whether a name is already taken. Alternatively, if your system has a built-in shell, you can type a whois command to query the registry directly. If the name exists in the database, someone else already holds the registration rights and you will need to choose a different name or a different TLD.1
Record your chosen domain name exactly as you intend to register it, paying close attention to spelling. The registration process is straightforward: go to a registrar's website, fill out the required form, and confirm your details. Make sure especially that you have not misspelled your desired domain name, because once it is paid for it is too late to change it without starting over. The registrar will also ask for your real-world address, and you should fill it properly since in some countries registrars may be required to close the domain if they cannot provide a valid address.1
Common Mistakes and How to Verify Your Setup
One frequent mistake is confusing the domain name with the full URL when configuring site settings or sharing links. If a platform asks for your website URL and you provide only the domain name without the scheme, the link may not resolve correctly in all contexts. Always include the scheme, typically https://, when you are asked for a complete URL. When a platform asks only for the domain, provide just the domain portion without the scheme or any path.2
Another common error is assuming that all TLDs are interchangeable. Generic TLDs like .com, .org, and .net do not impose particular criteria on the service, but other TLDs may have restrictions based on purpose, location, or institution type. Before selecting a TLD, confirm that it fits your intended use and does not carry eligibility requirements you cannot meet. The full list of TLDs is maintained by ICANN, and checking their policies can save you from a registration that turns out to be unsuitable.1
Finally, verify that your planned URL structure works by testing it in a browser after your site is live. Type the full URL for several pages into the address bar and confirm that each one loads the expected resource. If a URL points to a resource that no longer exists or has moved, visitors will encounter an error. As the owner of the web server, it is your responsibility to carefully manage each resource and its associated URL. Planning your paths before launch and checking them afterward reduces the chance of broken links reaching your audience.2
Frequently asked questions
Is a domain name the same thing as a URL?
No. A domain name identifies the web server, while a URL is the complete address of a specific resource on that server. A URL includes the domain name plus additional parts such as the scheme, path, parameters, and anchor.12
Can I own a domain name permanently?
No. You pay for the right to use a domain name for a set period and can renew that right. You never own the domain name itself, which ensures unused names eventually become available to others.1
What characters are allowed in a domain name label?
Labels may contain letters A through Z, digits 0 through 9, and the hyphen character. A hyphen cannot be the first or last character in a label, and labels are case-insensitive.1