language agnostic - What's the term for the part of the URL after the question mark?

Question

http://www.example.com?foo

What's the term for the foo part of the URL?

Answer 1

It's the query, or sometimes the query string.

To pinch a useful diagram from the URI RFC:

     foo://example.com:8042/over/there?name=ferret#nose
     \_/   \______________/\_________/ \_________/ \__/
      |           |            |            |        |
   scheme     authority       path        query   fragment