Equilibrium in economics is the sweet spot where supply meets demand. At this point, the quantity that producers want to sell exactly matches the quantity that consumers want to buy. The price at which this happens is the equilibrium price.
Example: If coffee shops charge $5 per cup and at that price consumers want to buy 1,000 cups and shops want to sell 1,000 cups — that is equilibrium. If the price rises to $7, shops want to sell more but consumers buy less (surplus). If it drops to $3, consumers want more but shops supply less (shortage).
Markets naturally move toward equilibrium through the "invisible hand" of price adjustments. Surpluses push prices down; shortages push prices up. In reality, markets are constantly adjusting — true equilibrium is a theoretical benchmark. Disruptions like government price controls, supply shocks, or demand shifts create temporary disequilibrium.