Lenovo notebooks basically have com ports outside their own series.

For example, the U-series S-series has no com port.

Com port is a serial communication port. The com port on a microcomputer is usually 9-pin, and there is also a 25-pin interface.

Com port is basically used in notebooks for external monitors, external projectors and so on.

Lenovo notebook does not need to set com port. Just connect peripherals and press fn+f3 to switch.