Acetylsalicylic acid, commonly known as Aspirin, is a medication used to relieve pain, reduce inflammation, and lower fever. It belongs to a class of drugs called nonsteroidal anti-inflammatory drugs (NSAIDs). Aspirin works by inhibiting enzymes involved in the production of substances that cause pain and inflammation in the body. In addition to its pain-relieving properties, Aspirin is often used in low doses to reduce the risk of heart attacks and strokes. It helps prevent blood clots by making platelets less sticky. However, it can cause side effects, such as stomach irritation, and should be used with caution in certain individuals.