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. They are essential tools in healthcare settings, ensuring precise dosages and minimizing contamination. Syringes can be made from plastic or glass and are often disposable to maintain hygiene. The needle size varies depending on the type of injection or procedure, with smaller needles used for vaccinations and larger ones for drawing blood. Proper disposal of used syringes is crucial to prevent needle-stick injuries and infections.