How Streaming Services Work

Streaming has become the dominant way many households watch video content, but the term itself simply describes a method of delivery: video sent over the internet and played back as it arrives, rather than downloaded in full before viewing or broadcast through a fixed signal. This page sets out, in general terms, how streaming services work and what tends to differ between them.

Delivery over the internet

When a video is streamed, it is broken into small pieces and sent to the viewer's device continuously while it plays. The device keeps a short buffer of upcoming video stored temporarily, which is why a slow or unstable internet connection can cause pauses while the system waits for more data to arrive. The quality of the picture, measured in resolution, is usually adjusted automatically depending on how fast and stable the connection is at any given moment, so that playback continues smoothly rather than stopping entirely.

Subscription and advertising models

Streaming services generally use one of two broad funding models, or a mix of both. In a subscription model, viewers pay a recurring fee for access to a catalogue of content, usually without interruptions from advertising. In an advertising-funded model, access is free or lower cost, but short advertisements appear between or during videos, similar in principle to traditional broadcast advertising. Some services offer both options, allowing viewers to choose a cheaper, advertising-supported tier or a more expensive, advertisement-free one.

Catalogues and exclusivity

Unlike broadcast television, where most households receive the same channels, streaming catalogues can vary significantly between services, and sometimes between regions as well. A programme available on one service may not be available on another, and the same title can sometimes move between services over time as distribution agreements change. This is one of the main reasons many households end up using more than one streaming service rather than just one, since no single catalogue typically covers everything a household wants to watch.

Devices used for streaming

Streaming apps can run on a wide range of devices, including smart TVs, dedicated streaming boxes or sticks that plug into a television, game consoles, computers, tablets and phones. The experience is generally similar across devices, though screen size, remote control design and how search results are displayed can all affect how easy a particular app is to use on a given device.

Internet connection requirements

Because streaming depends entirely on an internet connection, the speed and stability of that connection has a direct effect on viewing quality. Higher resolution video generally requires a faster and more consistent connection. Households with several people streaming different content at the same time, on different devices, need a connection capable of supporting that combined demand without one stream affecting the others.

Things worth comparing between services

When comparing streaming services in general, it can help to think about the size and type of their catalogue, whether they offer content in the languages and genres a household actually watches, how many devices or screens can be used at once under a single subscription, and whether an advertising-supported option is available if cost is a concern. Comparing services on these practical points tends to be more useful than comparing them purely on price, since the value of a subscription depends heavily on whether its catalogue matches what a household actually wants to watch.