A small perforated container, typically of metal mesh, designed to hold tea leaves, herbs, or spices while hot water circulates through it, extracting flavour, colour, and aroma. Placed in a cup or teapot and removed when the brew reaches the desired strength, the infuser keeps loose particles out of the drink. Designs range from simple mesh balls to basket infusers sized for teapots. Reusable infusers suit whole-leaf teas and custom herbal blends better than paper bags, giving greater control over strength, and they reduce packaging waste. They are easy to rinse clean and popular with tea enthusiasts and in foodservice.