How to setup a lock-screen pattern, pin or password on Android device

Nowadays android devices have become the most popular handset in everyone's hand. It is very easy to use and it has lots of features to manage our work. In case of lost or stolen our device, we are also loosing our important data inside the phone too. So we have to provide better security to our android device to protect it. The instructions presented below are shown that how to protect your phone from an unauthorized usage.