WhatsApp have released an app that enables users to use WhatsApp on their computer. Using WhatsApp on a computer is nothing new, the web service has been available for some time. This time though it is a dedicated app. Other third party applications do exist that also enable users to use WhatApp via a desktop app such as FreeChat but this is the first official app. You also get more support for native emoticons and better keyboard shortcuts compared to the web app. You still need to be logged into WhatsApp on your phone though as the desktop app only mirrors your phone so be careful with data usage.
The app is available for download from WhatsApp for Windows 8 and higher and Mac OS X 10.9 (Mavericks) and higher.