A syringe is a medical device used to inject fluids into or withdraw fluids from the body. It typically consists of a cylindrical barrel, a plunger, and a needle. Syringes come in various sizes and are commonly used for administering medications, vaccines, and drawing blood. Syringes can be made from plastic or glass and are often disposable to ensure hygiene. They are essential tools in healthcare settings, allowing for precise measurement and delivery of liquids. The use of syringes is crucial in procedures involving vaccination, insulin delivery, and blood tests.