Have you looked at the docs? They do totally different things.
- CGI serves web pages.
- LWP retrieves web pages.
This is a huge over-simplificaion. Check out the docs for some more info.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link
or How to display code and escape characters
are good places to start.