Enzymes activators are substances that enhance the activity of enzymes, but their antonyms are inhibitors, which reduce or block enzyme activity. Inhibitors can be competitive, non-competitive, or irreversible, and they act by either binding to the active site of the enzyme, preventing substrate binding, or by modifying the enzyme structure or function. Some well-known examples of inhibitors include poisons like cyanide, which blocks cytochrome c oxidase in the electron transport chain, and drugs like aspirin, which inhibits cyclooxygenase in the prostaglandin synthesis pathway. While enzymes activators are essential for physiological processes, inhibitors can be beneficial or harmful depending on their application, and they are commonly used in medicine, agriculture, and industry.