Whatsapp is a very nice application. As I am using this application since 2013.
How to make account on whatsapp and what are the features of whatsapp: -
You can download whatsapp from goggle playstore and then you can easily by following instructions can make account. As you made account you can see in the list of contact that how many of ypur friends are using whatsapp. you can easily chat with them. also you can make voice call or video calls with your friends and family you can share pictures on whatsapp also you can share vedios there. this application is very fast and easy to drive.
Whatsapp is a good way to conmect with friends and family whom are far from us. New feature of whatsapp is you can post videos and pictures as your whatsapp status and it will be disappear after 24 hours. also you can do privacy settings there that with whom you want to share your status.
Overall it is best in all way.
Thank you.