WhatsApp is a cross-platform messaging app that allows users to exchange text, images, video and audio messages for free over the internet using a data plan or Wi-Fi. It was founded in 2009 and has become popular as it eliminates the costs of SMS messaging and allows users to easily communicate with contacts across different mobile platforms through a simple to use interface.

3. WhatsApp
WhatsApp, a play on the casual greeting
"what's up?", is an adfree mobile messaging
app that allows users to exchange text and
media messages through their Internet data
plan or through Wi-Fi.
Users do not have to pay for SMS. Once you
start using WhatsApp to connect with your
friends, you'll wonder how you ever lived
without it!
https://en.wikipedia.org/wiki/WhatsApp

4. WhatsApp Inc. was founded in 2009 by Brian
Acton and Jan Koum, both veterans of Yahoo.
A cross – platform instant messaging
application that allows iPhone, BlackBerry,
Android, Windows Phones and Nokia
smartphones.
Users to exchange text, image, video and
audio message for free.
https://blog.whatsapp.com/

5. Especially popular with end users who do not
have unlimited text messaging.
Group chat options.
Technically speaking, WhatsApp users a
customized version of the open standard
Extensible Messaging and Presence Protocol
(XMPP).
Ainsley O'Connell. "Inside Erlang, The Rare Programming Language Behind
WhatsApp's Success". fastcolabs.com. Retrieved February 21, 2014.

9. How to use WhatsApp !
Download WhatsApp
Launch the app from your smartphone
Manage your Favorites.
Change your status
Invite friends
Start a chat
Wait for your message to be delivered to your
friend's phone
Manage your chats
Change your settings
WhatsApp Inc. (n.d.). "WhatsApp for Android". WhatsApp.com. WhatsApp Inc.
Retrieved 4 March 2016.

10. Characteristics of WhatsApp
Use & Benefits is immediately obvious
Enhanced through interaction
Appeals to people’s existing networks
Encourages interactions
Quality & benefits result in strong retention
https://blog.whatsapp.com/10000617/WhatsAppsupportformobiledevices

12. Operation of WhatsApp
No hidden cost
Multimedia
Group chat
No international charges
No to pins and user name
No need to log in / log out
Off line messages and much more……………..
"WhatsApp update adds support for Android Wear smart watches". theinquirer.net.

13. Functions of WhatsApp
Do not automatically download the
content
Save conversation
Install to emoticons
The enigma of double check
"https://en.wikipedia.org/w/index.php?title=WhatsApp&oldid=
713887734"

14. Advantages of WhatsApp
Service is completely free
Very easy to use
Do not have any advertisement on
display screen.
Automatically imports the contacts
Share location, photos & status
Unlimited message
http://www.quora.com/What-are-the-advantages-of-Whatsapp

17. Support only Smart phones
Access to internet
Cannot call using this app to your
friends for free
Your profile picture is visible to every
person having your contact number
http://www.quora.com/What-are-the-disadvantges-of-Whatsapp