Ben Eater | Tri-state logic: Connecting multiple outputs together - 8 bit register - Part 2 @BenEater | Uploaded 8 years ago | Updated 20 hours ago
With tri-state logic, a logic gate can be effectively disconnected from the circuit rather than assuming the normal 0 and 1 logic levels.

This video goes into more detail on what it means to output a 0 or 1 and then describes how and why we'd want to output neither. This detail is essential to how a bus works.

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See eater.net/bbcpu8-registers for more.