Equilibrium refers to a state of balance where opposing forces or influences are equal. In nature, this can be seen in ecosystems, where different species interact to maintain stability. For example, in a forest, the number of predators and prey can reach a point where their populations support each other, preventing overpopulation or extinction. In economics, equilibrium occurs when supply equals demand, meaning that the amount of goods available matches what consumers want to buy. This balance helps set prices and ensures that resources are used efficiently. When either supply or demand changes, the market seeks a new equilibrium to restore balance.