URL is a Uniform Resource Locator, commonly known as a web address. Its role is to tell the browser two things: where to find something and what to find.
What parts make up a complete address
Protocol. It specifies how content is transmitted. A common one is encrypted HTTPS, which means data is encrypted during transmission.
Hostname. This is the domain name to visit, and it tells the browser which server the request is sent to.
Port. It indicates which channel on the server the service uses. When the default value is used, it is usually omitted, so this part basically does not appear in the web addresses people see every day.
Path. It points out the location of the resource within the site. It reflects the content structure, and the hierarchical relationship between sections and pages can often be seen from the path.
Parameters. They start with a question mark and are used to pass additional conditions, such as filter conditions, page numbers, and source markers.
Fragment. It starts with a hash sign and points to a specific location within the page, often used for in-page jumps.
In actual use, most web addresses keep only a few of these parts. When visiting a section page, people often see only three parts: the protocol, the domain name, and the path.
Why it is worth caring about how it is written
Address structure is not just a technical detail; it also affects three things. First, readability—users can glance at an address and roughly know where they are on the website. Second, being understandable to retrieval systems—a clear and stable structure helps judge the relationships between pages and makes it easier to categorize by section. Third, being easy to share and analyze—short, readable addresses are easier to handle in both distribution and data analysis.
A few suggestions
Keep it as short as possible and relevant to the page content; use hyphens to separate words rather than underscores or direct concatenation; avoid long strings of meaningless parameters; avoid special characters that require escaping. Addresses should remain as stable as possible, and when adjustments are truly needed, set up redirects to avoid breaking existing links.
One more note
It is best to settle the address structure during the website planning stage. Making large-scale adjustments after launch affects not only your own pages, but also records that have already been indexed and links that have been referenced externally.