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A hot air balloon flies because hot air inside the balloon is less dense than the cooler air outside. This temperature difference creates lift, allowing the balloon to rise and float in the air. By controlling the temperature of the air inside the balloon, the pilot can control the balloon's ascent and descent.
A hot air balloon is called such because it is filled with hot air to make it rise. When the air inside the balloon is heated, it becomes less dense than the surrounding cooler air, causing the balloon to float upwards.
A hot-air balloon pilot is typically referred to as a balloonist or a balloon pilot.
The name "hot air balloon" comes from the fact that hot air is used to make the balloon rise. The balloon is inflated with heated air, which is less dense than the cool air surrounding it, causing the balloon to lift off the ground.
When a hot air balloon is filled with the hot air the air around the balloon is a lot denser. So by convection the balloon rises and the less dense air is replaced by dense air underneath it.