[fabbari]

A password hash is a simple hash of a password. Hash algorithms are made to be fast. KDF - key deriving functions - are slow by design and are made to derive a key from a given string. They are designed to be slow to make password searching slower. This is a 2c tour of the topic.

[johnisgood]

There are 2 comments to OP, and now the person can wonder which one is supposed to be slow or not.