Answer:
Keep electrical signal undistorted: When a switch forwards a frame, it regenerates an undistorted square electrical signal. And, In a simple light circuit, it switches between connected and disconnected. In a more complex multi-way system it switches between two wires which both go to the other switch. The other switch chooses which wire is connected and which is not. So both switches can connect or disconnect the circuit, at any time.
Step-by-step explanation: