An indifference curve is a graphical representation used in economics to show different combinations of two goods that provide the same level of satisfaction or utility to a consumer. Each point on the curve indicates a combination of the two goods where the consumer feels equally happy, meaning they have no preference for one combination over another. These curves help illustrate consumer choice and preferences. The shape of an indifference curve typically slopes downward, reflecting the trade-off between the two goods. As a consumer increases the quantity of one good, they must decrease the quantity of the other to maintain the same level of satisfaction.