A syringe is a device used either to inject or suck out a liquid.

Syringes are used in conjunction with hypodermic needles to inject liquid medications into body tissues; the process of giving medication into the body with a syringe and needle is called an injection. Syringes can also be used to suck out some liquid from a cavity.

Syringes have a hollow plastic or glass tube (barrel) with a plunger inside. The barrel of the syringe usually has graduated marks indicating the volume of fluid in the syringe. Pressing on the plunger forces the drug through the needle into the body.

Syringes nowadays are normally made of disposable plastic because re-using syringes and needles has proven to be a major source of spread of blood-borne diseases in the past.

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