A cocktail shaker is a device used to mix and chill cocktails by shaking ingredients together. Typically made of metal or glass, it consists of two or more parts that fit together, allowing for a secure seal during shaking. The most common types are the Boston shaker, which has two pieces, and the cobbler shaker, which includes a built-in strainer. To use a cocktail shaker, ingredients like spirits, mixers, and ice are added, and the shaker is sealed tightly. Shaking creates a frothy texture and blends flavors, making it essential for crafting drinks like Margaritas and Martinis. After shaking, the mixture is poured into a glass, often using a strainer to catch ice.