Diffrence between 'use' and 'require' function?

Use:

1. the method is used only for modules (only to include .pm type file)

2. the included object are verified at the time of compilation.

3. No Need to give file extentsion.

Require:

1. The method is used for both libraries ( package ) and modules

2. The include objects are varified at the run time.

3. Need to give file Extension.