Oh. Yeah. Bigger than our phones, which means they're stronger and can do all the metaphorical heavy lifting until we figure out how to make things small enough to work well on a phone. Part of why the design is important, because overloading it and being too unwieldy can happen.

[ Oh boy. That question gets a bit of a laugh because well. ]

Apps are "applications," so it's essentially... whatever you can think to make a phone do. There's simple ones and complex ones but it mainly depends on the task. Some out there can walk you through cooking dishes or you could find a game to pass the time.