Medical trials are research studies that test new treatments, drugs, or medical devices to determine their safety and effectiveness. These trials often involve volunteers who agree to participate, and they follow strict protocols to ensure reliable results. The trials are usually conducted in phases, starting with small groups and gradually expanding to larger populations. The results from medical trials help doctors and researchers understand how well a treatment works and if it has any side effects. Successful trials can lead to new therapies being approved for use in the general population, improving patient care and health outcomes.