A needle for a syringe is a thin, pointed device that is used to inject or withdraw fluids, such as medications, into or from the body. Syringe needles are typically made of stainless steel or other metals and are available in a variety of sizes, lengths, and gauge (diameter) options, depending on the intended use. The length and gauge of the needle determine its thickness and the amount of tissue it can penetrate, while the bevel or slant of the tip determines the direction of the flow of fluid. The selection of a needle for a syringe will depend on several factors, including the type and viscosity of the fluid to be injected, the intended route of administration, and the specific medical condition being treated. It is important to handle syringe needles with care and to follow proper disposal procedures to minimize the risk of injury or transmission of infectious agents. Additionally, it is essential to use a new needle for each injection to prevent the spread of disease and to ensure the accuracy of medication dosing.