Update WhatsApp is an app that lets you always have the latest available version of WhatsApp installed on your Android. The way this is done is simple: WhatsApp uploads the new versions first on their website, and then later on Google Play.
Once you install Update WhatsApp, you can stop worrying about updating your WhatsApp. As soon as the new version is up on the official website, the app will notify you and download it in a few seconds.
Update WhatsApp is a very simple application that does its job perfectly. Having said this, getting the latest WhatsApp version before anyone else doesn't usually give you any kind of benefit.
