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You have already seen the core idea of this module, just in a different form.
A transistor is a switch: on or off. That binary logic was the foundation of the first three modules.
A biological neuron is similar in one way: it receives signals and may fire only when those signals are strong enough. But it is different in an important respect. Neurons can be more or less active, not just fully on or fully off.
That flexibility is part of what makes neural systems so powerful. A switch can only say yes or no. A neuron can help represent something closer to how much.
Think of it as a dimmer switch. It can be more or less bright, not just fully on or fully off.