Difference between URL encoding and URL Rewriting

URL Rewriting is a technique for saving state or session information on the user's browser between page hits. It is a session management technique. The session information gets appended at the end of the URL, as an additional parameter.

Morevoer, if query string parameters are added to the URL, it is important that they
be properly URL encoded. URL encoding refers to the process of encoding special
characters in a string, according to the rules defined in RFC 2396. For example, a
space must be encoded in a URL string as a '+':

http://mypage.com/app/travel?country=Dominican+Republic