The term "active compound" refers to a molecule that has a specific biological effect. There are several synonyms for this term, such as bioactive substance, pharmacologically active compound, and active ingredient. These synonyms are often used interchangeably in the scientific community, but they all refer to a substance that has a direct effect on the body or a specific system within it. Whether it's a natural product, a synthetic drug, or a plant extract, the active compound is the key component responsible for the therapeutic effect. Identifying and isolating active compounds is a crucial step in drug discovery and development, as it allows researchers to study their mechanism of action and potential applications.