How are parallel circuits used in homes?
Parallel circuits are used throughout your home - because they allow current to keep flowing through various paths, so it is not restricted to flow through one path.
Here are two examples of parallel circuits in your home.
Most times, the electrical outlets in a particular room will be on a single circuit, because the single circuit can usually handle the load of several devices. (It's rare that everything is running all at once.) If this was a series circuit, you would need to have something hooked up to every outlet and powered ON in order to turn a single device on.
Within a multi-bulb light system, a parallel circuit ensures that when one bulb burns out, the others still stay lit because each light has its own circuit. In a series circuit all of the bulbs would go out - then figuring out which one is "burned out" is like figuring out which bulb has gone on a string of Christmas lights. Yikes!