How to set Password in Raspberry Pi (Raspbian)

The Default Password of  Raspberry Pi image of Debian Squeeze, Wheezy is
        
           username: pi
           password: raspberry 

Now How to Change your password :

Type 

pi@raspberrypi: ~$ passwd

(current) UNIX password: raspberry   # default (Current) Password

Enter new UNIX password: newpassword   # Your New Password Type here

Retype new UNIX password: newpasssword   #Repeat Your New Password.