Feedback inhibition is a regulatory mechanism in biological systems where the end product of a metabolic pathway inhibits an earlier step in the pathway. This process helps maintain homeostasis by preventing the overproduction of substances. For example, when the concentration of a product, such as amino acids, becomes too high, it can bind to an enzyme involved in its synthesis, reducing the enzyme's activity. This mechanism is crucial for efficient resource use within cells. By controlling the production of enzymes and other molecules, feedback inhibition ensures that energy and materials are not wasted. It allows cells to adapt to changing conditions and maintain balance in their internal environment.