Whatsapp:-

          Whatsapp is the most popular instant messaging app which allows you to communicate with friends using text, phone call, video, sharing of files, in group or personal and other media. It is basically an alternative way to send free SMS text messages using internet connection.

          Whatsapp was founded by Jan Koun and Brian Acton. It is one of the best and fastest growing freeware cross platform messaging and Voice over IP (VoIP) service. It provides service for text and audio messaging, free voice calls and exchanging photos or videos and even for sharing of limited types of documents. The desktop app works in exactly the same way as WhatsApp web. The new desktop app is available for windows 8 and above and is synced with WhatsApp on your mobile device. Additionally, it can also be used with Chrome, a web-based browser.