Video on demand (VOD) is a generic term covering several areas. It includes all video content requested on-demand by users. This could be premium movies or libraries of TV shows, sporting events or concerts. It could also include user-created video content. In addition, some IPTV operators are starting to offer the ability to see all the TV programs aired on their multichannel pay-TV channels in the previous 24 or 48 hours on demand. This video content is held in a constantly updated library hosted by their network.