You can try out the newest features of the app before it gets released to the public. If you know which of your apps have a beta program to join, you can quickly join the program within the app itself. However it had a limited number of people that could join the beta program. Once it’s full you shall participate unless some users leave or the developer expense limits you to scan the beta programs of all your installed apps periodically and send you a notification. Once a limited beta program becomes available to join, you can see the concept is simple and very useful.