Medicines are substances or compounds used to prevent, diagnose, treat, or relieve symptoms of diseases and health conditions. They work by restoring or maintaining normal body functions, fighting infections, reducing pain, or managing chronic illnesses. Available in various forms such as tablets, capsules, syrups, injections, and ointments, medicines are developed through rigorous research and clinical trials to ensure safety and effectiveness. Proper usage under medical supervision ensures the best therapeutic outcomes while minimizing side effects and risks.