What does FOR do?

[Dark Blade]

Can someone explain what the Command Prompt command FOR does?

I've tried reading the help file for it, but it is a BIT too complicated for me.

[2k_dummy]

Runs a specified command for each file in a set of files.

FOR %variable IN (set) DO command [command-parameters]

  %variable  Specifies a replaceable parameter.
  (set)      Specifies a set of one or more files.  Wildcards may be used
  command    Specifies the command to carry out for each file.
  command-parameters
             Specifies parameters or switches for the specified command.

To use the FOR command in a batch program, specify %%variable instead of
%variable.