Uniform resource locator (URL)

A URL, or Uniform Resource Locator, serves as the unique address for each and every resource available online.

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In the vast interconnected world of the internet, the URL, or Uniform Resource Locator, serves as the unique address for each and every resource available online. It's the string of characters you type into your browser's address bar to visit a website, download a file, or access any other type of content on the internet. In essence, URLs are the road signs of the digital highway, guiding users to their desired destinations.

While the term URL may seem technical and complex, it's actually quite straightforward once you break it down. In this comprehensive glossary article, we will delve into the depths of URLs, exploring their structure, function, and importance in the realm of cybersecurity. By the end, you'll have a thorough understanding of URLs and their role in navigating the online world.

Understanding the structure of a URL

Every URL is composed of several distinct parts, each serving a specific purpose. Understanding these components is the first step in comprehending how URLs work. The structure of a URL typically includes the protocol, domain name, path, and query string.

Let's take an example URL: https://www.example.com/path?query=string. In this URL, 'https://' is the protocol, 'www.example.com' is the domain name, '/path' is the path, and '?query=string' is the query string. Each of these components plays a crucial role in locating the desired resource on the internet.


The protocol, also known as the scheme, indicates how a browser should retrieve a resource. The most common protocols are HTTP (Hypertext Transfer Protocol) and HTTPS (HTTP Secure), but others like FTP (File Transfer Protocol) and mailto are also used.

HTTP and HTTPS are the backbone of data transfer on the web. HTTPS is essentially HTTP with an added layer of security, using encryption to protect the data being transferred. This is particularly important when sensitive information, like passwords or credit card numbers, is being transmitted.

Domain name

The domain name is the human-readable address of a website. It's what you type into your browser to visit a specific site. Domain names are registered through organizations called domain name registrars and are unique to each website.

Domain names are made up of two parts: the second-level domain and the top-level domain. In 'www.example.com', 'example' is the second-level domain and 'com' is the top-level domain. The second-level domain is typically the name of the website or organization, while the top-level domain indicates the type of entity (like .com for commercial, .org for organization, .edu for education, etc.).

The function of a URL

A URL's primary function is to locate a resource on the internet. When you type a URL into your browser, it sends a request to the server associated with the domain name in the URL. The server then responds with the requested resource, which is displayed in your browser.

URLs also provide context about the resource. By looking at a URL, you can often determine what to expect from the webpage. For example, a URL ending in '/contact' will likely lead to a contact page, while a URL ending in '.jpg' will likely lead to an image file.

URLs and search engines

URLs also play a significant role in search engine optimization (SEO). Search engines like Google use the structure and content of URLs to understand and rank webpages. A well-structured URL that clearly describes the page's content can help improve its ranking in search results.

For example, a URL like 'www.example.com/blog/cybersecurity-tips' is more SEO-friendly than 'www.example.com/post123'. The former clearly indicates that the page is a blog post about cybersecurity tips, while the latter provides no context about the page's content.

URLs and cybersecurity

URLs are not just tools for navigation and SEO; they're also critical in the realm of cybersecurity. Cybercriminals often manipulate URLs in an attempt to trick users into visiting malicious websites, downloading malware, or revealing sensitive information. This is known as phishing.

By understanding URLs and how they work, you can better protect yourself from these threats. For example, knowing that 'https://' indicates a secure connection can help you avoid entering sensitive information on an unsecured site. Similarly, being able to recognize a legitimate domain name can help you avoid phishing scams.

Phishing and fake URLs

Phishing is a common cybercrime where attackers trick users into revealing sensitive information, like passwords or credit card numbers. One common phishing technique is to create a fake URL that closely resembles a legitimate one, in hopes that the user won't notice the difference.

For example, an attacker might create a URL like 'www.exmaple.com' to trick users who intend to visit 'www.example.com'. At first glance, the fake URL looks legitimate, but a closer look reveals that the 'm' and 'a' in 'example' are swapped. By understanding the structure of URLs and paying close attention to the URLs you visit, you can avoid falling for these scams.

HTTPS and secure connections

As mentioned earlier, HTTPS is a secure version of HTTP. It uses encryption to protect the data being transferred between the user and the server. This is crucial when sensitive information is being transmitted.

When you visit a website, you can check the URL to see if it uses HTTPS. If it does, you'll see 'https://' at the beginning of the URL, and a padlock icon will typically appear in your browser's address bar. This indicates that the connection is secure, and any data you enter on the site is encrypted. If the URL uses 'http://' without the 's', the connection is not secure, and you should avoid entering sensitive information.


URLs are an integral part of the internet, guiding users to resources and providing context about those resources. By understanding the structure and function of URLs, you can navigate the web more effectively and protect yourself from cybersecurity threats.

Remember, a URL is more than just an address; it's a roadmap to the vast array of resources available on the internet. So the next time you type a URL into your browser, take a moment to appreciate the complex system that makes it all possible.

This post has been updated on 17-11-2023 by Sofie Meyer.

Author Sofie Meyer

About the author

Sofie Meyer is a copywriter and phishing aficionado here at Moxso. She has a master´s degree in Danish and a great interest in cybercrime, which resulted in a master thesis project on phishing.

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