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I use it for a lot, but one I haven't seen mentioned. I use it to support my ham radio hobby. I have a satellite tracker for when I want to contact radio sats, a solar weather app for checking HF propagation and I have echolink which let's me connect to hundreds of radio repeaters around the globe.
*HF = high frequency, its a section of radio frequencies that bounce off the atmosphere. Let's you talk worldwide if you have the right frequency and conditions. Solar weather significantly impacts how radio waves interact with the upper atmosphere.
which one do you use? can it show where is it on a camera background?
I use one called W1ANT Satellite Tracker. I don't think it has a camera feature. The fun for me is locating the sat and following it from a map. In practice this involves me looking like a lunatic running around my apartment complex with my HT held sideways, staring up at the sky.