Linear playback is a media model where content runs in one fixed order from beginning to end. The viewer cannot jump branches, change timing, or affect the sequence the way they would in an interactive system. VHS tape is a classic example: the signal is played as recorded, and any "experience" depends on the tape, the player, and the timing of the stream.
In cyber security, this matters because fixed sequencing limits how much behavior can be hidden inside the medium and how reliably content can be reproduced for analysis. Defenders care about linear playback when preserving evidence, reviewing training media, or reconstructing legacy formats, because timing and order can affect what is seen and when. Attackers can also exploit predictable playback in social engineering or media-based delivery chains, where a user is steered through a scripted sequence that looks passive but carries instructions or payload cues. Understanding linear playback helps analysts separate the media container from any interactive logic built around it.