It assess the effectiveness of a medicinal, surgical, or behavioral intervention. They are the most common technique for researchers to determine whether a new treatment, such as a new medicine, diet, or medical equipment is safe and effective in humans. A clinical trial is frequently performed to determine whether a novel treatment is more successful than the current treatment. Safety and efficacy of drugs, diagnostic tests, technologies, and treatment regimens that are intended for human use. It is human-centered medical research. It refers to studies conducted on healthy or ill people.