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Typically, modern printers connect using USB. You will need to find a free USB port on your computer to plug it in. Older printers (as well as decreasing numbers of newer printers) connect via a parallel port. A parallel port is a somewhat rectangular port (rounded edges) with two rows of sockets (25 sockets in all). To see a graphic of a parallel port, go here: http:/images.google.com/images?q=paralell+port
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Parallel ports typically have 25 or 36 pin ports. Serial ports, by contrast, have only 9 pins. Both type of ports have two rows of pins.
USB port (Universal Serial Bus) replaces the parallel port
parallel port if you want to know why go to it140 if you know what that is.
That depends on how many are installed. One used to be standard on the motherboard. Some modern PCs have deleted that port since USB is much easier to use. If your machine has PCI or other expansion card sockets you can buy parallel port expansion cards and add several. It is also possible to add parallel ports using USB to parallel port adapters.How many do you want?
Parallel Port
A video port has 15 pins (3 rows of 5 each) A video port, also known as a Serial Port, has 3 rows of 5 pins which is 15 pins.
The primary difference is that a USB interface type printer requires the computer to have a USB port (as all modern computers do) whereas a parallel interface type printer requires the computer to have a parallel (LPT) port (which many modern computers do not have.) There are USB-to-parallel converters however which plug into USB and allow the use of parallel printers. Additionally, many legacy applications only have support for parallel printers, in these cases, in order to use a USB printer it may be necessary to create a virtual parallel port and map the USB printer to it.