Anchor: It is a device normally made of metal used on board to make fast a vessel to the bed of a body of water (sea) to prevent it from drifting/dragging due to the wind, current and wind & current. Anchoring can be of the following two types either temporary or permanent.
Permanent anchors are used in the creation of mooring of rigs, platforms and other such structures, which are rarely moved and require special AHT and crews to move & maintain them.
Normal anchoring of ship is known as temporary anchoring, which is for few hours or days, the ship usually carries one or more anchors for this purpose. One anchor each on the bow (fwd) port and starboard.