Serial card for serial communication
UART is inside the pc if it has serial port if it has usb ports then use usb to serial converter as Amit give you idea
There is nothing called serial card. It is called RS232 to USB Converter or vice versa. If you have RS232 port in your PC, no need of converter. If it is a latest laptop or desktop without RS232 port, you can go for the converter. It is available in all the computer shops.
Amit Kumar Das
They plug into the slots found in most desktops.
They were common at one time, but not so much now.
Yes, serial cards are available for PCs, but I installed one on my PC with some difficulty