An anchor is a mooring device used by a ship or vessel to secure it to the bottom of the sea floor when the vessel is not underway. Modern anchors are typically made from metal and can conform to any one of the existing designs depending on the use it will see. The anchor works in concert with the anchor chain or rode to resist the vessels movements, modern anchors actually hook themselves into the seabed when set properly. When not in use anchors can be stored on deck of the vessel or more commonly in an anchor pocket built into the ships hull.
Anchors can be classed by either their design or by their ability to hold the vessel