activator

This term describes an agent that triggers a transition from a dormant or inactive state to an active one. In chemistry and biology, it refers to a substance that increases the rate of a reaction or the efficiency of an enzyme, often by altering the molecular structure to allow a process to begin. In mechanical or electronic contexts, it refers to the physical component, such as a switch or sensor, that initiates a programmed sequence. While similar to a catalyst, an activator specifically focuses on the initiation or the "turning on" of a system rather than just the acceleration of an existing process.