There are two types of electric circuits: series and parallel circuits. A series circuit is an electric circuit that has series connections to work, and it doesn't have branches. One advantage of having a series circuit is that if it goes out, you know that one of the components have failed. However, one disadvantage of having a series circuit is that if one component goes out, then the whole circuit is going out. You can find series circuits in flashlights and christmas lights.
A parallel circuit is a circuit that is connected in branches. An advantage of having a parallel circuit is that if one lightbulb goes out, the others keep working. A disadvantage is that parallel circuits use a lot of wires. You can find parallel circuits in your home and at your school.