LPT stands for parallel interface LPT 1 and is a parallel port 1.
COM stands for serial interface COM 1 and is serial port 1.
Different devices have different interface requirements. Generally, parallel port is used for printing, and now printers are all usb.
Most computers have one or two LPTs, which are usually called LPT 1 and LPT2. Some computers support three LPTs, called LPT3, but LPT 1 is the default LPT no matter how many they have. When users need to add new devices, they can add parallel port adapters.
It should be noted here that LPT can only be used for output and input. LPT parallel port is an enhanced two-way parallel transmission interface, which was the most commonly used interface for scanners and printers before USB interface appeared.
Extended data:
Generally, when installing a printer driver, the printer connection port will be automatically selected, but sometimes you will be prompted to manually configure the printer port.
In general, the parallel port of computer motherboard integration is LPT 1. If the parallel port added by the external parallel card is LPT3 or LPT2, the corresponding USB port needs to be selected when using the USB cable, and a USB port will be automatically created every time the system is installed.
For example: USB00 1, USB002, which correspond to the USB of the host in turn.