The term mooring lines refers to the ropes used to tie a boat to the dock or pier. These lines are used to securely anchor the boat when it's in port. Mooring lines are essential for keeping the boat stable and preventing it from moving excessively due to currents, wind, or waves. They are usually made of strong, durable ropes, such as nylon or polyester, to ensure a good hold.

Fenders are protective devices, generally made of rubber or similar material, that are attached to the sides of the boat to protect the paint and structure from damage caused by contact with the dock or other boats while docked. Fenders cushion the impact and reduce the risk of scratches or structural damage.

In summary:

Mooring lines : These are the ropes used to tie the boat to the dock.

Fenders : protect the boat during docking, preventing damage to the structure and paint.