On Demand is the information access based on the user's needs at any time, such as selecting a watch on television back in time through the website instead of having to keep track of a TV show based on a table with a preset station.
On Demand to access information according to the user over time, such as watching television, dating back through the site. Instead of tracking the TV station preset table.
On Demand to access data according to the needs of users at any time, such as the watch on television back through the website. Instead of monitoring the TV schedule, the station set beforehand.