Applications, or “apps,” are one of the highest grossing electronic commodities on the market, and many developers work independently, so an easily identifiable domain extension like .APP provides valuable networking power. There are more than a million different apps for mobile devices, and the number continues to grow, making the .APP TLD a great way to connect to a multi-billion dollar industry. .APP can be used for developers, programmers, designers, or any business that operates as a hub for selling, reviewing, or advertising apps.
There is no specific procedure related to the registration of a domain name.
.app domain names are allocated on a "first come, first served" basis.