A sinker is a type of fishing lure that is designed to be heavier than other lures in order to reach deeper depths and stay stationary in the water column. It typically has a lead weight attached to it, which helps it to descend quickly to where the fish are holding. Sinkers come in various sizes and shapes depending on the type of fishing being done and the desired depth of the lure. They can be used alone or in combination with other types of lures such as spinners or crankbaits.