Which is part of the URL is the query string?

A query string is the part of the URL which comes after the ‘?’ character. The query string is made up of one or more parameters (called query parameters) and each parameter is made up of ‘key=value’ pair. The query parameter ‘ThemeId=8904’ is made up of the key called ‘ThemeId’ and the value called ‘8904’
For More Information Please Refer:
You May Also Like to Read: