A cocktail shaker is a tool used to mix drinks by shaking them together. It typically consists of a metal or glass container with a lid that fits snugly over the top. The lid has a built-in strainer that allows the liquid to pass through while catching any ice or other solids that may be in the drink. To use a cocktail shaker, the ingredients for the cocktail are placed into the shaker, the lid is sealed tightly, and the shaker is then vigorously shaken to mix the ingredients together. The shaker is then opened and the drink is poured into glasses to be served. Cocktail shakers are an essential tool for anyone who enjoys making mixed drinks at home.