Drugs, or medications, are substances used to prevent, diagnose, treat, or alleviate symptoms of diseases and health conditions. They can be classified into various categories, such as prescription medications, which require a doctor's approval, and over-the-counter (OTC) drugs, which can be purchased without a prescription. Medications can come in different forms, including tablets, capsules, liquids, and injections. The effectiveness of drugs depends on their active ingredients and how they interact with the body. Some medications target specific conditions, like antibiotics for bacterial infections, while others, like pain relievers, help manage symptoms. It is essential to use medications as directed by healthcare professionals to ensure safety and effectiveness.