Uniform Resource Locator, or more commonly as web address or just address. The string of addressing information that is entered or appears in the address or location bar of a web browser, and used to retrieve the page or document at that address.
For example, the URL of this web page is: https://ultimatenetsolutions.com/uniform-resource-locator/
A URL has several sections. The part before and including the :// is called the Protocol and generally appears as https:// or https:// the extra “s” meaning the connection is secured by an encryption method called Secure Sockets Layer or SSL.
The next part is the Server Name from which the web page is to be served. It usually appears as www. which stands for World Wide Web. Because the default server name is assumed to be www unless designated otherwise, it is increasingly omitted in the trend to shorten or simplify web addresses.
The next is the Domain Name, ultimatenetsolutions.com, the final extension ending commonly in most addresses, .com (although many other extensions are widely available).
One or more forward slashes “/” then define a hierarchical file path to the actual web page, in this case the uniform-resource locator. And once again increasingly omitted in the trend towards simplicity, the page may reflect a File Extension indicating the page type, typically .html (Hypertext Markup Language) or .php (Hypertext Preprocessor), but it could just as easily designate a document to be downloaded like .pdf or .zip, or a picture like ,jpg or .png, etc.
If URLs are longer, contain question marks, or are otherwise difficult to decipher, it usually means that variable parameters are appended in real time to add some type of dynamic functionality, such as encryption, access to databases, etc. We call those URLs dynamic as opposed to static, like the above example when page being served is not dependent upon additional real-time computation from the web server.