Demand 5 is the brand name of video on demand services offered by Channel 5 in the United Kingdom. The service, which was previously known as 'Five Download', went live on 26 June 2008.

As Five Download the service offered Windows Media Video format downloads of the US imports CSI, House and Grey's Anatomy. Individual episodes of these series could be 'rented' with some episodes available 7 days before they appear on TV.

More varied content from Channel 5's programming has become available since June 2008 with a wider prevalence of free content offered for 30 days after broadcast. In January 2009, Demand 5 began to offer content in the Flash Video format, allowing users with Apple Macintosh computers to access their content.

The service is accessible only within the United Kingdom. However, most foreigners, especially those in the United States, can download the Xbox Live application using a UK Xbox Live Free account and they would be able to view the programming on their native Gold account.

In economics, demand is the desire to own anything, the ability to pay for it, and the willingness to pay. Basically Demand refers to how much (quantity) of a product or service is desired by buyers. The quantity demanded is the amount of a product people are willing to buy at a certain price; the relationship between price and quantity demanded is known as the demand relationship. (see also supply and demand). The term demand signifies the ability or the willingness to buy a particular commodity at a given point of time.

Economists record demand on a demand schedule and plot it on a graph as a demand curve that is usually downward sloping. The downward slope reflects the relationship between price and quantity demanded: as price decreases, quantity demanded increases. In principle, each consumer has a demand curve for any product that he or she would consider buying, and the consumer's demand curve is equal to the marginal utility (benefit) curve. When the demand curves of all consumers are added up, the result is the market demand curve for that product. If there are no externalities, the market demand curve is also equal to the social utility (benefit) curve.