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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.
How does one get into this? (I would like to do this)
Ham radio is licensed by the country you live in. In the US, the basic technician license is very cheap and the test to get it is fairly easy with an abundance of online materials, including answer keys, to study. The reason these licenses are important is because ham operators need to operate within legally defined band plans, or radio frequency allocation guidelines. Emergency services, search and rescue, your nations military, all use specific radio bands given to them by the government. The license helps teach you how to avoid interfering with someone who can get you into serious trouble. It also helps keep you safe, and requires you to learn some basic electrical knowledge that frankly will be mildly useful the rest of your life. Amateur radio is a really fun skill that isn't that hard to learn. If you have any more questions, feel free to ask and if you want specific information about your countries licensing, Im happy to help look it up.
EDIT: Just to add, you can always listen without a license. That's why scanners exist, but you need a license once you hit the button to transmit on a ham radio frequency.
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.