If you want to book a hotel, there's a mobile app for that. Need to track your schedule? There’s a mobile app for that. If you want to meet someone online, there's a mobile app for that. And if you want to learn to meditate or learn a language, there's certainly a mobile app for that. Fact is, whatever you can think of, these days there's very probably a mobile app that will help you do what you want/need to do. Do all apps make money? While there are a lot of ‘vanity’ projects (where someone builds a mobile app just for the sake of building it) which are generally offered free of charge, the vast majority of developers build mobile apps that have one underlying purpose - to make money.