The seabed is the bottom of the ocean. Alternatively, it is known as the seafloor, sea floor, ocean floor, or ocean bottom. The floor of all the world's oceans is known as the seabed.

The structure of the seabed of the global ocean is governed by plate tectonics. Most of the ocean is very deep, where the seabed is known as the abyssal plain. Seafloor spreading creates mid-ocean ridges along