A swab is a small tool used for cleaning or sampling surfaces. It typically consists of a stick with a soft tip made from materials like cotton or foam. Swabs are commonly used in medical settings to collect samples for testing, but they are also effective for cleaning delicate items, such as electronics or instruments. In addition to medical uses, swabs are often found in households for tasks like applying ointments or cleaning small areas. They are versatile and can be used with various cleaning solutions to remove dirt, dust, or contaminants from surfaces, making them a handy tool in both professional and personal settings.