What are the differences between Intel's Z690, Z590 and Z490 chipsets?

Actually we should see the chipset of the motherboard as part of the CPU itself, since it includes a series of communication interfaces that would normally be placed inside the processor itself, but which are not so dependent in terms of width Bandwidth and latency are placed on a separate chip, usually remote from the central processor, but on the same motherboard.

The chipset is nothing more than a hub of those different interfaces that through a high-speed interface connects with the central processing unit, which in the case of Intel CPUs is the Direct Media Interface or DMI. That is, the chipset accesses the different peripherals through their interfaces and transmits the information to the CPU through said interface, which by the way in the case of the Z690 is twice as fast per transmission line as the Z590 and the Z490 when using version 4.0 and not 3.0.