Silicon is not a great conductor of electricity.
In fact, it's a semiconductor.
Pathways for electrons are etched or "painted" onto thin wafers of Silicon.
The "paint" contains just enough "dopant" to increase the conductivity of the path.
When pathways cross each other, they must be insulated or separated from each other.
The round posts are thickened areas where fine gold wires may be attached leading to other circuits.
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