Difference between 'if -e' and 'if -f'

Question

There are two switches for the if condition which check for a file: -e and -f.

What is the difference between those two?

Answer 1

$ man bash

       -e file
              True if file exists.
       -f file
              True if file exists and is a regular file.

A regular file is something that isn't a directory, symlink, socket, device, etc.