La retransmisión (en inglés streaming, también denominado transmisión, transmisión por secuencias, lectura en continuo, difusión en continuo o descarga continua) es la distribución digital de contenido multimedia a través de una red de computadoras, de manera que el usuario utiliza el producto a la vez que se descarga. La palabra retransmisión se refiere a una corriente continua que fluye sin interrupción, y habitualmente a la difusión de audio o vídeo. Este tipo de tecnología funciona mediante un búfer de datos que va almacenando el flujo de descarga en la estación del usuario para inmediatamente mostrarle el material descargado. Esto se contrapone al mecanismo de descarga de archivos, que requiere que el usuario descargue los archivos por completo para poder acceder al contenido. La retransmisión requiere de una conexión por lo menos de igual ancho de banda que la tasa de transmisión del servicio. La retransmisión de vídeo por Internet se popularizó a fines de la década de 2000, cuando la contratación del suficiente ancho de banda para utilizar estos servicios en el hogar se hizo lo suficientemente barato.

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Streaming media is multimedia that is constantly received by and presented to an end-user while being delivered by a provider. The verb "to stream" refers to the process of delivering or obtaining media in this manner; the term refers to the delivery method of the medium, rather than the medium itself, and is an alternative to file downloading, a process in which the end-user obtains the entire file for the content before watching or listening to it. A client end-user can use their media player to begin to play the data file (such as a digital file of a movie or song) before the entire file has been transmitted. Distinguishing delivery method from the media distributed applies specifically to telecommunications networks, as most of the delivery systems are either inherently streaming (e.g. radio, television) or inherently non-streaming (e.g. books, video cassettes, audio CDs). For example, in the 1930s, elevator music was among the earliest popularly available streaming media; nowadays Internet television is a common form of streamed media. The term "streaming media" can apply to media other than video and audio such as live closed captioning, ticker tape, and real-time text, which are all considered "streaming text". The term "streaming" was first used in the early 1990s as a better description for video on demand on IP networks; at the time such video was usually referred to as "store and forward video", which was misleading nomenclature. As of 2016, streaming is generally taken to refer to cases where a user watches digital video content and/or listens to digital audio content on a computer screen and speakers (ranging from a desktop computer to a smartphone) over the Internet. With streaming content, the user does not have to download the entire digital video or digital audio file before they start to watch/listen to it. There are challenges with streaming content on the Internet. If the user does not have enough bandwidth in their Internet connection, they may experience stops in the content and some users may not be able to stream certain content due to not having compatible computer or software systems. As of 2016, two popular streaming services are the video sharing website YouTube, which contains video and audio files on a huge range of topics and Netflix, which streams movies and TV shows. Live streaming refers to Internet content delivered in real-time, as events happen, much as live television broadcasts its contents over the airwaves via a television signal. An example of live streaming is Metropolitan Opera Live in HD, a program in which the Metropolitan Opera streams an opera performance "live", as the performance is taking place; in 2013–2014, 10 operas were transmitted via satellite into at least 2,000 theaters in 66 countries. Live internet streaming requires a form of source media (e.g. a video camera, an audio interface, screen capture software), an encoder to digitize the content, a media publisher, and a content delivery network to distribute and deliver the content. Live streaming does not need to be recorded at the origination point, although it frequently is.

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