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As a free service, WhatsApp allows for messages and calls on both desktop and mobile devices. Part of what makes this app appealing is that it works on various phone and computer operating systems, helping with messaging. It can also take advantage of Wi-Fi and cellular data to make one-on-one or group calls.No matter where you are in the world, you can feel close to your relatives and friends at any time, communicating with them in real time by sending instant messages. Sending real time messages is a great way to reinforce relationships and to keep in touch, and real time messaging makes you feel close to the other person without having to actually be physically close
Nice article by whatsapp