Clinical trials are one of the final stages of a long and careful research process to help patients live longer, healthier lives. They help doctors and researchers find better ways to prevent, diagnose, or treat diseases. Clinical trials test new types of medical care, like how well a new cancer drug works. The trials help doctors and researchers see if the new care works and if it is safe. They may also be used to compare different treatments for the same condition to see which treatment is better, or to test new uses for treatments already in use.