A crude illustration of a mooring
A mooring is a device to which a boat can attach so that it can remain in the same position.

A mooring is typically a heavy object located on the sea bed with a rope or cable going to the surface where a float makes it possible to pick it up from a boat.

Example: On The Great Barrier Reef, a vast number of public moorings are set out in popular areas where boats can moor. This is to avoid the massive damage that would be caused by anchoring in the same spot.

On inland waterways, boats can moor against mooring posts along the riverbank or towpath.