A Hot Air Balloon is a lighter-than-air aircraft consisting of a bag with an open bottom, called an envelope, which contains heated air with a gondola, wicker basket or a capsule suspended underneath, which carries passengers and a source of heat. The heated air inside the envelope makes it buoyant since it has a lower density than the colder air outside the envelope.
The hot air balloon is the first successful human-carrying flight technology with the first un-tethered manned hot air balloon flight taking place on 21st November, 1783, in Paris, France, in a balloon created by the Montgolfier brothers.
Hot air balloon can be steered to a limited degree by changing the altitude of the flight. Wind in the northern hemisphere tends to turn right due to coriolis effect as the altitude increases.