Explained Simply
Rocket stages are sections that separate when their fuel is finished so the rocket becomes lighter.
Many rockets are built in stages. A stage is a major section with its own engines and fuel. When one stage finishes its job, it separates so the rocket becomes lighter.
This is useful because carrying empty fuel tanks into space would waste energy. By dropping used parts, the rocket can continue with less weight.
Common idea behind staging
The first stage helps the rocket leave Earth. Later stages keep pushing the payload higher and faster until it reaches the planned path.
Did You Know?
Some modern rockets can even land and be reused after separation.