What is simple circuit?

A simple circuit is a circuit containing one voltage or current source in series with, or in parallel with, one load.

Since it is a simple circuit, both definitions, series and parallel, are equivalent and mean the same thing.
well ist a circut that only has one wire and if one power outlet goes out so do the rest and as you can read i can't really find out i was tring to find out and thats not simple because im a 10 year old in 5th grade! (advanced 5th grade)