Strainers are kitchen tools used to separate solid particles from liquids. They come in various forms, such as mesh, colander, or fine sieve, and are commonly used for tasks like draining pasta or rinsing fruits and vegetables. The design allows liquid to pass through while retaining larger solids. In addition to cooking, strainers are also used in other fields, such as brewing and chemistry. In brewing, they help filter out hops and sediment, while in chemistry, they assist in separating mixtures. Overall, strainers are versatile tools essential for both culinary and scientific applications.