Rosetta is a spaceship that was sent to study a comet called 67P/Churyumov-Gerasimenko. The comet is like a big dirty snowball made of ice, dust, and rock.
Rosetta flies around the comet in a special path called an orbit. Think of it like a circle in the sky around the comet, like how you might circle around a toy with a toy airplane. But it's not a perfect circle, it's more like a squiggly path that loops around the comet.
This path is important because it lets Rosetta get close to the comet and take pictures and measurements of it. This helps scientists understand more about how comets formed and what they are made of.
To stay in this orbit, Rosetta has to use its engines to adjust its speed and direction. It also has to be careful not to crash into the comet or other objects around it.
Overall, Rosetta's orbit is a way for us to learn more about comets and the history of our solar system.