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For example, if you have connected a push button to your uC pin. Normally +5V will be going to uC pin through the pull up resistor. During this case, the voltage at the uC pin will be around +4.9V. When you press the push button, it wont be completely zero signal due to some leakage. During the cases, the signal will be around +0.5V. But still there is a signal on the path. To differentiate whether the push button is pressed or not, logic levels are used. This is just an example.
yeah all the operations will be performed in digital. But can sense analog signal using ADC pins in micro-controller. Even that analog signals are converted to digital internally.
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