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A USB port is both and input and output port. Depends on what is connected to it as to which is functions as. Connect a camera and it is an input device. Connect a printer and it is an output device. Connect a printer/scanner and it is both.
A USB port takes a device that can be both an input and an output device. For instance, an external USB hard-drive can be written to (by keyboard) and data can be extracted (put up on the monitor or sent to a printer).
No. VGA port is not either serial or parallel port. It is a different interface. If you need a serial output, you need a VGA to serial converter.
The best way is to attach a serial port using device to the serial port of your computer and use your preferred program to send data to the device
A USB port is both an input and an output.
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Input/Output Controller Card
Output, the sound is coming from the computer. Headphones are output; they produce something after receiving signal from another device, such as a computer or electronic player. When you use headphones they go in the output port of your computer.
A bar code reader is an input Device. Although they sometimes output a visible light, the purpose is to gather data from a printed code and input that data into your system (computer, Point of Sale, etc.)