what is a rinse out?

I seen it everywhere like a rinse out conditioner and then you leave your other conditioner in

i mean is it a leave in conditioner or a regular conditioner you just leave in. And what is the rinse out used for?
Hair Type: 3b c iii
Co wash: V05 Moisture milks passion fruit smoothie
Styling: Queen heelne gel no cones. Apply leave in first then some gel scrunch let air dry then SOTC. Comes out frizz free and pretty. Then add some coconut oil :]