system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how is hashing a one way process (not reversible)?
gpt
You can think of it like a shadow of a object. If you only see the shadow you cannot have the original object, but if you have the original object you always can create the exact shadow.

This is the reason you just save the shadow of a password in the database and compare the shadows.