How does MCU communicate with WiFi module?

Microcontrollers is an integrated circuit chip, which uses VLSI technology to integrate CPU with data processing ability, ram, ROM, various i/o ports and interrupt system Timer / counter and other functions (which may also include display drive circuit, pulse width modulation circuit, analog multiplexer, a/d converter and other circuits) are integrated into a small and perfect microcomputer system composed of a silicon chip, which is widely used in the field of industrial control. From the 1980s, from the then 4-bit and 8-bit single-chip microcomputer, it has developed to the current 300m high-speed single-chip microcomputer.