What Is OTT? Streaming Explained
Last updated November 2026
Direct answer
OTT stands for 'over-the-top': any video, audio or messaging service delivered over the open internet, on top of (bypassing) traditional cable, satellite or telecom TV. Netflix, Prime Video, Disney+ Hotstar, JioHotstar and YouTube are all OTT services. The term comes from the box the signal jumps over — the set-top box.
The term is older than the industry it now describes. This guide explains what OTT means, how the technology works, and how it differs from the television it replaced.
What does OTT stand for?
OTT is short for over-the-top. The name was coined in the 2000s for services that ride 'over the top' of an existing network infrastructure — the telecom or cable pipe — without the network operator being involved in the content, the billing or the control of what plays. When you watch Netflix on a Jio or Comcast connection, neither Jio nor Comcast has any say in what you watch; they just carry the bits.
The label originally covered voice calls (Skype over your phone line) and messaging (WhatsApp over SMS networks) before it settled on its dominant modern meaning: video streaming delivered over the public internet.
How does OTT streaming work?
Every OTT platform is a chain of four parts. Content lives on a server; it is encoded and compressed into adaptive bitrate streams (many quality levels of the same video); a content delivery network (CDN) — the physical backbone of streaming — copies those files to servers in or near every major city; and the player on your phone, TV or laptop requests video in small chunks, switching quality up or down in real time based on your bandwidth.
This is why a video rarely buffers mid-scene anymore: the adaptive stream silently downgraded it when your connection dipped. It is also why the industry could scale to billions of viewers — the same architecture serves one viewer or a hundred million, which broadcast frequencies never could.
OTT vs cable vs IPTV: what is the difference?
Cable and satellite deliver a fixed schedule of channels through a closed, operator-controlled network — the operator decides the channel lineup and the price. IPTV (the technology behind Jio set-top boxes and modern cable replacements) also delivers television, but through the internet, over a managed private network, still as channels on a schedule.
OTT is the open-internet case: any app on any connection, on demand, with the relationship between the viewer and the content owner direct. The practical differences that matter: OTT is global (cable is regional), on-demand by default (cable is scheduled), and priced per service rather than per bundle — until the 2020s, when streamers started re-bundling each other.
What are the main types of OTT service?
The industry is divided by business model more than by technology. SVOD (subscription video on demand) is Netflix and Disney+: a monthly fee, no ads (or a cheaper ad tier). AVOD (ad-supported video on demand) is YouTube's model and the free tiers of JioHotstar: free to watch, paid for by advertising. TVOD (transactional VOD) is Apple TV's store: pay per title. FAST (free ad-supported streaming TV) is the newest: free linear channels — Pluto TV, Samsung TV Plus — that mimic cable's channel-flipping.
The 2020s' defining trend is the mixing of these models: ad tiers inside SVOD (Netflix, Disney+), live channels inside on-demand apps (Netflix Live, Prime Video channels), and every major service quietly becoming a hybrid.
When did OTT start?
The first widely used internet-video technology was RealNetworks' RealVideo in 1995; the first mass-market OTT services were YouTube in 2005 and Netflix's 'Watch Now' in January 2007; the industry's industrial phase began with Netflix's 2016 global expansion and the 2019–20 launches of Disney+, Apple TV+ and HBO Max. For a full chronology, see the master timeline.