WhatsApp is a popular messenger app which allows users to communicate with others with simple text,photos,videos and calls all for free.Now they have launched a Beta programme where users can get early access to updates and test before the general public,This however does not mean all is rosey as in beta you are prone to bugs etc but you do get to see new features before others and it seems plenty of us like this kind of environment.
You can leave the testing program at any time. If you leave the testing program and a public version of the app is available, you can switch to public version by uninstalling the testing version and installing the app again on Google Play.