Whatsapp is a mobile application which is available on playstore for android devices. Whatsapp is a messenger kind of application which is used for chatting, or sending videos or photos using internet connection.
Whatsapp uses our phone directories to find people who are available on whatsapp and can chat or call with each other without using local or std charges.
Whatsapp initially was a paid app for which a user had to pay nearly around 50 rs per annum to get going.There are also group chat options where a maximum of 100 members can chat with each other.
There are some drawbacks too;we get to here the echo sound while call when connected to strong wifi network .The other drawback is people get addicted to whatsapp and waste their precious time on whatsapp.