For example when I have URL:
What is the professional name of the parameters we pass after question mark '?'
In this case:
In this case the variable name is category and value is programming.
You can call it url parameter or request parameter.
Wikipedia answer: https://en.wikipedia.org/wiki/URL
- An optional query component preceded by a question mark (
?), containing a query string of non-hierarchical data. Its syntax is not well defined, but by convention is most often a sequence of attribute–value pairs separated by a delimiter.
Query delimiter Example Ampersand (