Domain Names and URLs: Understanding Website Addresses Before Launch

When you prepare to launch a website for the first time, you will encounter terms like domain name, URL, and IP address used in overlapping ways. Understanding how these pieces fit together helps you choose a sensible address and avoid confusion when configuring your site.

Reading a Website Address Piece by Piece

Suppose you are planning a small gardening blog and you choose the hypothetical address https://mygardenblog.example.com/plants/tomato-guide. This single line in your browser's address bar contains several distinct pieces of information. The part mygardenblog.example.com is the domain name, which identifies the specific server hosting your content. The word plants is a path segment that tells the server which section of the site to load, and tomato-guide points to a particular page within that section. The https at the very beginning is the scheme, indicating the protocol your browser uses to request the page. None of these parts are interchangeable: removing or changing any one of them would direct the browser to a different resource or produce an error.¹²

This hypothetical example also shows why people sometimes confuse a domain name with a URL. The domain name is only the server-identifying portion of the full address. The complete URL includes the scheme, the domain, and everything that follows. If you share only the domain name with someone, they will reach your site's default page. If you share the full URL, they will land on the exact page you intended. For a first-time site owner, keeping this distinction clear prevents mistakes when sharing links or setting up redirects.¹

Record each component of your planned address on paper before you register anything. Write down the domain name you want, then sketch out two or three example page URLs that use that domain. This simple exercise reveals whether your chosen name works well in longer paths and whether it reads clearly when combined with descriptive page names.

What a Domain Name Actually Is

A domain name is a human-readable address for a web server available on the Internet. Every Internet-connected computer can be reached through a public IP address, such as 192.0.2.172 in IPv4 format or a longer hexadecimal string in IPv6 format. Computers handle these numeric addresses easily, but people have a hard time remembering them or figuring out who runs the server behind them. Domain names solve this problem by providing a memorable text label that maps to the underlying IP address.²³

The structure of a domain name is straightforward. It is made of several parts 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 site to meet any particular criteria. Other TLDs enforce stricter policies: .gov is reserved for government departments, and .edu is limited to educational and academic institutions. Local TLDs such as .us or .fr are supposed to indicate a resource in a particular language or country.²

Everything to the left of the TLD consists of labels. A label is a case-insensitive sequence of one to sixty-three characters containing only the 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. The label immediately before the TLD is sometimes called the second-level domain. You can also create subdomains under any domain you control, so a single registered domain can host multiple distinct sections of content, each with its own address.²

The Parts of a URL Beyond the Domain

A URL, or 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. A URL is composed of different parts, some mandatory and others optional. The scheme comes first and indicates the protocol the browser must use, usually HTTPS or HTTP for websites. The authority follows, separated from the scheme by the characters ://, and includes the domain name and optionally a port number.¹

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. Following the path, optional parameters can appear as key-value pairs separated by the ampersand symbol, giving the server extra instructions before it returns the resource. Finally, an anchor marked by a hash symbol points to a specific spot within the resource itself, such as a heading on a long page. The part after the hash is never sent to the server with the request.¹

A useful way to remember these parts is the postal address analogy. The scheme is like the postal service you choose, the domain name is the city or town, the port is like a zip code, the path is the building, the parameters are extra details such as an apartment number, and the anchor is the specific person you are addressing. This analogy is not perfect, but it gives first-time builders a mental model for how each component narrows down the destination from a broad network to a precise location within a page.¹

How Domain Names Reach Servers

IP addresses are perfectly functional for computers, but human beings have a hard time remembering strings of numbers. To make things easier, we alias an IP address with a human-readable name called a domain name. Using the domain name is the easiest way for people to reach a computer over the Internet. The translation between the readable name and the numeric address is handled by DNS servers distributed around the world.³²

When you type a domain name into your browser, a specific lookup process begins. Your browser first asks your computer whether it already recognizes the IP address associated with that name, using a local DNS cache. If the answer is found locally, the browser proceeds directly to negotiate content with the web server. If not, your computer queries a DNS server, whose job is to tell your computer which IP address matches each registered domain name. Once the IP address is known, the browser can request the page.²

This lookup system means that your choice of domain name does not change how the underlying network operates, but it does determine what visitors type to reach you. A clear, memorable domain name reduces friction for your audience. Since IP addresses can change over time while the domain name stays the same, the domain acts as a stable reference point that you control independently of any particular server's numeric address.³²

Registering and Securing Your Domain Before Launch

You cannot permanently buy a domain name. 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. This system exists so that unused domain names eventually become available for others. Companies called registrars use domain name registries to keep track of the technical and administrative information connecting you to your domain name.²

Check whether your desired domain name is available before you invest time building content around it. Most registrar websites provide a search tool that tells you whether a name is already taken. Alternatively, if you use a system with a built-in shell, you can type a whois command to query the registry directly. If the query returns no result, the name is likely available for registration.²

When you complete the registration form, make sure you have not misspelled your desired domain name, because once it is paid for, the choice is final. The registrar will also ask for your real-world address. Fill it in properly, since in some countries registrars may be required to close the domain if they cannot verify a valid address. After registration, the registrar confirms that your domain is properly set up in their system.²

Choosing an Address That Works for Your Project

URLs represent a human-readable entry point for a website. They can be memorized, and anyone can enter them into a browser's address bar. Because people are at the core of the Web, it is considered best practice to build what are called semantic URLs, which use words with inherent meaning that can be understood by anyone regardless of their technical knowledge. A URL like mygardenblog.example.com/plants/tomato-guide tells a visitor exactly what to expect before the page even loads, whereas a string of random characters reveals nothing.¹

When choosing your domain name, consider how it will look as part of longer URLs. A short, clear domain keeps your full addresses readable even when paths and parameters are added. Avoid hyphens at the beginning or end of any label, since these are technically invalid. Also remember that labels are case-insensitive, so capitalization does not create a distinct name, though consistent lowercase styling in your links avoids visual confusion for readers.²¹

Use subdomains if your project has clearly separated sections that benefit from distinct addresses. For any domain you control, you can create subdomains with different content located at each one. This approach keeps your main domain simple while giving each section its own recognizable prefix. For a first-time builder managing a single small site, however, a single domain with descriptive paths is usually sufficient and easier to maintain.²

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, and optional parameters or anchors. The domain is one component within the full URL.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 it. You never own the name outright, which ensures unused names eventually become available to others.²

What should I do if I realize my domain name is misspelled after paying?

Once payment is complete, the registration is final. The best practice is to double-check the spelling on the registration form before submitting. If you discover an error afterward, you would need to register the corrected name separately.²