URL parameters are key–value pairs added to a web address to pass extra information, often used for tracking, filtering content, or personalizing pages. They help marketers and developers understand user behavior, campaign performance, and dynamic page requests without changing the core URL.

Semrush has published ‘What Are URL Parameters? A Guide on How to Use Them’.

Sergei Bezdorozhev says, “URL parameters appear after a question mark (?) and include key-value pairs that are separated by one or more ampersands (&), which means:

  • Everything before the question mark (?) is a standard URL
  • All parameters come after the question mark (?)
  • Each parameter is written as a key and value separated by an equal sign (category=shoes)
  • Multiple parameters are separated with an ampersand (&)

Multiple URL parameters combined. And what you see on the page can adjust based on those values.

URL Parameters vs. Query Strings

The terms “URL parameters” and “query strings” are often used interchangeably, which is perfectly fine in most contexts.”

What Are URL Parameters? A Guide on How to Use Them

Semrush