Detailed Explanation
The subject or participant is the individual at the center of every clinical trial, the person whose voluntary participation makes clinical research possible. Whether receiving the investigational product, an active comparator, or placebo, each participant contributes to the scientific knowledge that may benefit future patients. The terms "subject" and "participant" are used interchangeably in clinical research, though "participant" has gained favor in recent years as it better reflects the voluntary nature of involvement and the partnership between researchers and those they study.