Here's why:

* Parallel circuits have multiple paths for electricity to flow. Each component (like a lamp) is connected to the power source independently.

* Series circuits have only one path for electricity to flow. If one component is removed or fails, the entire circuit is broken.

In a parallel circuit:

* If you remove one lamp, you are simply removing one of the paths for electricity to flow.

* The other lamp remains connected to the power source and continues to receive electricity, so it stays on.

Think of it like two separate roads leading to the same destination. If you close one road, traffic can still flow on the other road.