html - What is the meaning of ? (question mark) in a URL string?

Question

What is the difference between using

href="../usermanagement/search_user.jsp?"

and

href="../usermanagement/search_user.jsp?pagename=navigation"

in file navigation.jsp?

question from:https://stackoverflow.com/questions/33041449/what-is-the-meaning-of-question-mark-in-a-url-string

Answer 1

Its name is query string. After the question mark you can pass key-value pairs and use them server-side.