what is the importance of fuses?

They are placed in electrical equipment and in houses (although most houses now use circuit breakers) as safety devices. If a short occurs and too much electrical current is going through the circuit, the fuse "blows" (meaning it melts, the circuit is not complete, no current can flow through an open circuit, so the electrical current stops until the problem is fixed. Otherwise, a fire could start and/or the equipment burned beyond repair.

Thanks it's helped lots!!

It stop's you from getting hurt!