Poka-Yoke is a Japanese phrase meaning mistake proofing.

Poka-Yoke is meant to shape behavior at the level of execution. There are two approaches to this. One is to prevent humans from making a mistake, to physically prevent it. If it’s not possible to prevent the mistake, you can use poka-yoke to anticipate and warn of mistakes.

For Example: Here is a set of electrical connections. Although their are majorly 3 Power lines (Live, GND, Neutral) but still to avoid wrong connections of modules and parts of electronics we use different connectors, having different shapes and sizes to prevent human errors.