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most computers don't come with a serial port. Still, so many network device require a serial connection for console management. Simple adapters (like the one in this video) can be used to add one, or more, physical serial ports to a laptop or desktop computer.
If you manage network equipment. Or, if you are a field technician, you really should have one of these USB-To-Serial adapters in your tool bag.
SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Converter Cable
get one from Amazon here: amzn.to/3RECA1S