How you can Explain the Concept of "Consumer Surplus"?

Consumers always like to feel like they are getting a good deal on the goods and services they buy and consumer surplus is simply an economic measure of this satisfaction. For example, assume a consumer goes out shopping for a CD player and he or she is willing to spend $250. When this individual finds that the player is on sale for $150, economists would say that this person has a consumer surplus of $100.

A Difference between consumer willingness to pay on a commodity and its actual price or equilibrium price.