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The logic Input is a small and convenient way to input digital logic commands (high or low) into your circuit.
The logic input has two states, logic low and logic high (1 and 0). The number 0 on the board means logic low-level, the number 1 means logic high-level.
You could connect multiple digital modules to the logic input component and decide using the switch if the module you’ve connected will receive a high-level signal or low-level signal.
This is very useful for applications that you would like to behave in a certain way, such as remain the logic high-level all the time, no programming skills or engineering is required.