What does initialize the ps4 mean

Initialisation of your PS4™ system restores system settings to default values. It deletes data saved on system storage and deletes all users and their data from the system. Select (Settings) > [Initialisation] > [Initialise PS4], and then follow the on-screen instructions.


Initializing your PS4

How to Factory Reset a PS4 (Initialize, Delete All Data)

How To Initialize A PS4 (Reinstall System Software)