The term "latency" refers to the lag between input and output, also referred to as "lagging." Glass to glass is a common expression for it in video. It gauges how long it takes for a live video stream to get from the camera lens' front glass to the glass of viewers' computer screens.

When a game is in progress and your neighbour cheers for a goal while you're still waiting for the player to fire the ball, latency is to blame. The three awkward seconds a reporter at the scene spends staring into the camera before responding to the news anchor's query are the result of latency.

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