TVOD is Transactional VOD is when a one-off payment (or transaction) is made by the viewer to allow themselves access to specific pieces of content. TVOD comprises of two main categories, these being; 1) Pay-Per-View (e.g. a viewing of an event purchased from Sky Sports Box Office) or; 2) Electronic-Sell-Through whereby a piece of content is ordered through a device for the viewer to keep (e.g. purchasing a film on Apple iTunes). Purchase/Electronic-Sell-Through sometimes also includes the purchase of a physical disc.