Injection is a method of delivering substances directly into the body using a syringe and needle. This technique is commonly used for administering medications, vaccines, or other treatments. By injecting a substance, it can quickly enter the bloodstream or target specific areas, providing faster effects compared to oral medications. There are different types of injections, including intravenous (into a vein), intramuscular (into a muscle), and subcutaneous (under the skin). Each type has its own purpose and is chosen based on the medication being given and the desired effect. Proper technique and hygiene are essential to ensure safety and effectiveness.