Blimps are large balloons stretched out to look like an egg or cigar. This makes them lighter than air. A blimp can carry people. By adding a keel and framework blimps became much bigger. Using engines and propellers the blimp can go up, down and forward.
Controls help the blimp stay straight and steady.
A blimp can fly against the wind. Some blimps crossed the Atlantic ocean carrying passengers. People usually ride in a gondola, a large box or room under the blimp. Long ago many people wanted to ride in blimps to go places. Airplanes were not yet carrying passengers.