Why do I need a pull up resistor?

Question

Pull-up resistors are used to ensure a logical level at a pin. Pull-up resistors are used to pull the value to a logical high state in the figure.

Hagrid P Hazard · Accepted Answer

Pull-up resistors are used to ensure a logical level at a pin. Pull-up resistors are used to pull the value to a logical high state in the figure.

Why do I need a pull up resistor?

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