Streaming media are multimedia that are constantly received by, and normally presented to, an end-user while being delivered by a streaming provider (the term “presented” is used in this article in a general sense that includes audio or video playback).

The name refers to the delivery method of the medium rather than to the medium itself.

The distinction is usually applied to media that are distributed over telecommunications networks, as most other delivery systems are either inherently streaming (e.g., radio, television) or inherently non-streaming (e.g., books, video cassettes, audio CDs). The verb ‘to stream’ is also derived from this term, meaning to deliver media in this manner. Internet television is a commonly streamed medium.

Attempts to display media on computers date back to the earliest days of computing in the mid-20th century. However, little progress was made for several decades, primarily due to the high cost and limited capabilities of computer hardware.

From the late 1980s through the 1990s, consumer-grade personal computers became powerful enough to display various media. The primary technical issues related to streaming were:

• having enough CPU power and bus bandwidth to support the required data rates
• creating low-latency interrupt paths in the operating system (OS) to prevent buffer underrun.

However, computer networks were still limited, and media was usually delivered over non-streaming channels, such as by downloading a digital file from a remote web server and then saving it to a local drive on the end user’s computer or storing it as a digital file and playing it back from CD-ROMs.