Digital circuits are divided into two main categories based on how they process information. Combinational Logic
There is only hierarchy. From transistors to gates, gates to flip-flops, flip-flops to registers, registers to datapaths, datapaths to processors, processors to systems. digital logic and computer design
From that single, primitive question, we have built cathedrals. Digital circuits are divided into two main categories
A wire is either at 0 volts or 5 volts (or 3.3V, or 1.8V these days). That’s it. The universe of computation begins with this binary act: gates to flip-flops