What is the difference between demand supply and price?

Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various price levels, while supply refers to the quantity that producers are willing and able to sell at those prices. Price is the monetary value assigned to a good or service, which is determined by the interaction of demand and supply in the market. When demand exceeds supply, prices tend to rise, and when supply exceeds demand, prices generally fall.