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default password raspberry pi

User management in Raspberry Pi OS is done on the command line. 
The default user is pi , 
and the password is raspberry .

change password raspberry pi

sudo raspi-config

Select option 2, and follow the instructions to change the password.

In fact, all raspi-config does is start up the command line passwd application, which you can do from the command line. Simply type in your new password and confirm it.

passwd