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A video streaming service may need to deliver huge amounts of data to millions of viewers at the same time, over connections that range from fast home Wi-Fi to unreliable mobile networks. Videos should start quickly, adapt to changing network conditions, and keep playing without constant buffering.

This lesson covers how video and audio playback works at scale, how streaming services adjust video quality to each viewer's network, and how they deliver huge amounts of data to millions of viewers at the same time.

It also covers how to approach media streaming in a system design interview, since designing a video or music platform is a common interview problem.