In Perl, what is the difference between use and require for loading a module?

Question

What is the difference between doing use My::Module and require My::Module?

Answer 1

From perldoc -q "difference between require and use":

use Module is like require Module, except that use

4.1: loads the module at compile time, not run-time.

4.2: imports symbols and semantics from that package to the current one.