Subcutaneous injection is a medical procedure used to deliver medication directly into the tissue beneath the skin using a small needle. This technique is effective and easy for administering treatments such as insulin for diabetic patients, hormone therapy, and some other medications that require slow and direct absorption. It is usually performed in areas like the arm or abdomen, where fatty layers are close to the skin surface. This type of injection is easy to administer at home under medical supervision, providing comfort for patients who require ongoing treatment.