Laravel's application key - what it is and how does it work?

Question

From what I know, the app key in Laravel provides protection for session and sensitive data, but what I want to understand is how exactly does it work? What is the purpose o

Answer 1

App Key is used for all encrypted data, like sessions,Password, remember token etc. passwords saved with Hash::make() will no longer be valid after create app key:generate.

you can be get little some idea from here link1 and link2