Hooding is a special ceremony that happens when people graduate from school, like college or university. It's called "hooding" because they wear a special kind of cape called a hood. This cape has a special color that represents the school they went to or the subject they studied.
The hood is placed over the graduate's head by someone who is called a "hooder." This is usually a professor or someone important who helped the graduate during their time at school. When the hood is on, it means that the person has completed their studies and has officially become a graduate!
It's a special moment for the graduate and their family and friends, and they get to wear their new hood proudly as they walk across the stage and receive their degree.