Marijuana, also known as cannabis, is a psychoactive drug derived from the Cannabis plant. It contains a chemical called THC (tetrahydrocannabinol) which is responsible for its mind-altering effects. Marijuana has been used for various purposes, including medicinal and recreational use, for thousands of years. Research in the area of marijuana focuses on a variety of aspects, including its potential medical benefits for various conditions such as chronic pain, epilepsy, and anxiety, as well as its potential risks and side effects. Additionally, research also explores the effects of marijuana on the brain, the development of marijuana-based medications, and the social implications of its legalization and regulation. Overall, research on marijuana is a complex and multi-faceted field that continues to evolve as attitudes and regulations surrounding the drug change.