Mean of Demand and Supply

Today a Friday morning i have work up and turn on the TV to the channel 11 to see Fox's news the women have very important information. She have been talking about the mean about demand and supply. Well this what she have said "Demand is certain of good or service that consumers Buy in all different prices. But in Supply it is the ability of the producers to have good and services at a different price in a various market place" But then her time was up and they they had to go sport but It feel good that we learn some thing new every day of our life's.