Final answer:
A simple circuit consists of a single voltage source and a single resistance in a closed loop, allowing current to flow. A parallel circuit has multiple pathways for current to flow.
Step-by-step explanation:
A simple circuit is a circuit that consists of a single voltage source and a single resistance, connected in a closed loop, allowing current to flow. In a simple circuit, the current has a single path to follow. An example of a simple circuit is a battery connected to a resistor in a closed loop.
A parallel circuit, on the other hand, is a circuit that has multiple pathways for current to flow. In a parallel circuit, each component is connected to the same two points, creating multiple branches. An example of a parallel circuit is a circuit with two resistors connected to a battery in a way that each resistor has its own pathway for current to flow.