All the above is true. Operationally, a stall happens when you slow the airplane down and increase the angle of attack over the wing so it is no longer producing lift. Student pilots practice doing them so they know how to get out.
It is not particularly dangerous to do stalls if you are careful about it, but I find them to be rather uncomfortable. There is a possibility of going into a spin if the pilot doesn't pay attention. But that, too, can be recovered from.
The other day I did a power-off stall. I slowed the airplane down, applied full flaps, then reduced power. I raised the nose untill it buffeted, then the wing lost lift and the nose dipped. I lowered the nose some more and applied full power and flew away.
A dashing and heroic personage! See pilot. A member of the elite company of the human race that can actually slip the surly bonds of Earth. They can fly, too.
Old fashioned aviators wear leather helmets and flight jackets and silk scarves and goggles. New fashioned ones fly Beechcraft Bonanzas while sipping cappuccino. Both are just a leetle bit cooler than the average groundling.
Pulling out of the loop, the aviator sent her biplane into a death defying spin and landed perfectly in front of the crowd at the airshow.