Ships have anchors to help them stay still in the water. Imagine you are playing with a toy boat in the bathtub. If you want your boat to stay in one place, you can hold it with your hand, right? That’s like what an anchor does!
The anchor is a heavy thing that goes down into the water and holds the ship in place, so it doesn’t float away. Just like when you tie your toy to a table so it doesn't move, the anchor helps keep the ship safe and steady.
So, when a ship wants to stop or stay in one spot, it drops its anchor into the water, and that helps it stay where it is!