People can get badly burnt in arson attacks and some are even killed.
Arson attacks on schools can endanger lives, upset pupils and staff and interrupt your education.
It can cost millions of pounds to rebuild schools that have been burnt down and even small fires can end up costing schools tens of thousands.
In some cases pupils' valuable coursework has gone up in smoke, putting extra pressure on those who are about to take exams.
Arson attacks on schools can also lead to pupils losing teaching aids, classrooms or other facilities.
Some schools have been so badly damaged that pupils have had to move schools while their old one is being rebuilt, which can cause lots of difficulties.