A dispenser is a device designed to release a specific amount of a substance, such as liquid, powder, or solid, in a controlled manner. Common examples include soap dispensers, which provide a measured amount of soap for handwashing, and beverage dispensers, which serve drinks like soda or juice. Dispensers can be found in homes, restaurants, and public places. These devices can be manual or automatic. Manual dispensers require a user to press a button or lever, while automatic dispensers use sensors to detect when a user is present, dispensing the substance without direct contact. This feature is often seen in hand sanitizer dispensers to promote hygiene.