Question

What is a circuit, and what parts make up a circuit?

Answer 1

A circuit is a a roughly circular line, starting and ending at the same place.
A source of electrical power, a material which the electricity can flow.
Something to power it (which can be a light bulb)

Answer 2

Electric Circuit is the path through which electric charges flow in order to conduct current.

Several basic components of circuit would be: "Switch", "Voltage", "Wires"

Hope this helps!