A Series Circuit has more than one resistor, or something that uses electricity. It gets its name from having only one path for the charges to move along. The resistors share the same amount of electrons, but split voltage. They equally get the same amount of voltage. If a resistor is broken then no charge will be able to go through because there is no alternative route. Old christmas lights are series circuits because if one bulb goes out, the whole string won't work.
A Parallel circuit differs from a Series. Unlike the series circuit, it has multiple paths for the electrons to travel along. The electrons have a choice to go through any of the paths. In a parallel circuit, electrons split up and choose the "path of least resistance". They share the same voltage. Parallel circuits are found most homes. This is so when you turn something off everything doesn't go off.