kinds of PC port

USB

Universal Serial Bus (USB): A bus I / O (input / output) that can transfer data at up to 12 megabits per second.
Goodbye parallel and serial ports are sluggish, now its time Universal Serial Bus (USB). Faster, more powerful and more flexible and really berazaskan Plug and Play (no longer a Plug and Pray). Even the USB 2.0 version just released is able to provide the level of performance and speed comparable to a kind of high-speed bus IEEE 1394. Some things you need to know about USB:
Faster than the parallel or serial ports with transfer speeds of up to 12 mbps (even to the latest version, can reach speeds of 480 mbps!)
Can connect up to 127 peripherals
Widely accepted, both in terms of hardware, software (read: operating systems), or user
Requires Windows 98 up to full compatibility

Paralel

Parallel port (DB-25) is one of the sockets on the personal computer to communicate with external devices such as printers older models. Because the parallel port is often also called printer port. Companies that introduce Centronic port is, then this port is also called the Centronics port. The simplicity of this port in terms of programming and interface with the hardware to make this port is often used for simple experiments in the design of electronic equipment.

Serial

in computing, a serial port is a serial communication through physical antart advance or transfer the information in or out one bit at a time or contrast the parallel port.

PS/2

Ps 2 connector used to connect a keyboard and mouse to a PC compatible computer systems. Its name comes from the IBM Personal System / 2 series personal computer, which was introduced in 1987. A PS / 2 mouse connector generally replaced the older DE-9 RS-232 "serial mouse" connector, while the keyboard connector is replaced with a larger 5-pin DIN used in IBM PC / AT design. A PS / 2 mouse and keyboard interfaces are electrically similar and employ the same communication protocol. However, a keyboard and mouse port system may not be interchangeable from two different devices using a set of commands. Following the release USB keyboard, PS / 2 keyboard and mouse become less popular.

VGA

VGA card is a component whose job it generates a visual display of the computer. Almost all programs produce visual output, VGA card is the hardware that gives instructions to the monitor to display a visual output that we can see.