A Dose-Response Curve is a graphical representation that shows the relationship between the dose of a substance, such as a drug or toxin, and the biological response it produces. Typically, as the dose increases, the response also increases, illustrating how the body reacts to varying levels of exposure. This curve helps researchers understand the effectiveness and safety of substances. The shape of the curve can vary, often appearing as a sigmoidal (S-shaped) curve. It provides critical information about the threshold dose needed to elicit a response and the maximum effect achievable. Understanding this relationship is essential in fields like pharmacology and toxicology, where it informs dosage recommendations and safety assessments.