The mobile apps economy is experiencing rapid growth. They are essential for mobile devices and are the main component of an economy the weighs billions. There is an uncountable number of mobile apps out there generating billions of dollars each year.
Google’s Android and Apple’s IOS in a few years have completely taken over the mobile OS market. The have an overwhelming control over this market with a combined market share of 99.8% as of 2017. For now and the foreseeable future there is no reason to think their reign will end anytime soon.