Salt configuration key

I was checking the system configuration and came across the following:
salt YouMustSetASecretKeyHere!!

What is salt used for? What type of key should we put there and where is it placed?

Thanks!

The salt is used to randomize the links created for password reset requests. It should be a long string of random characters.

It is only placed in config.inc.php.

Got it thanks. This is the easy issue today! :slight_smile: