Demand in economics refers to the consumer's desire and ability to purchase a good or service. It is the willingness of consumers to buy a product or service at a given price.

Key aspects of demand include:

• Desire: Consumers must want the good or service.
• Ability to Pay: Consumers must be able to afford the good or service at the given price.
• Specific Price: Demand is always related to a specific price point.
• Specific Time Period: Demand is measured over a particular period of time.

Demand is often depicted graphically as a demand curve, which illustrates the relationship between the price of a good or service and the quantity demanded for a specified time period. Generally, the demand curve is downward sloping, indicating an inverse relationship between price and quantity demanded, often referred to as the Law of Demand.