"Video on demand" is referred to as VOD. With this streaming technique, users can get video content whenever they want.
With on-demand video streaming, users can access the content online. When a video is streamed, the user watches the video while it downloads.
Over-the-top (OTT) technology is used to offer online VOD content, which means that it is broadcast online as opposed to through more conventional broadcasting channels like satellite or cable.
The entertainment industry, in particular, values VOD material highly.