In terms of home wiring system, fuses and circuit breakers are safety devices located on your electrical panel to prevent over loading and fires. They stop the electrical current if it exceeds the safe level for some portion of the home electrical system. Overloading means that the appliances and lighting in the home regularly demand more electrical current then the home electrical system can safely deliver. If the demand for electrical current exceeds the safe level a fuse opens once and must be replaced to reconnect the circuit.
A circuit breaker trips its switch to open the circuit and the circuit is reconnected by closing the switch manually. There are at least two different types of circuit breakers. One has a control handle that swings all the way to OFF when it is tripped. The other has an intermediate position close to ON (sometimes it is difficult to see that it has tripped). Both types of circuit breakers must be reset with the hand control after problem has been eliminated. The first type should simply be move back to ON, the second moved first to OFF and then to ON.