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Sound Card: A sound card is an expansion board that enables to produce sound as output that can be heard
through speakers or headphones. It is also used to record sound as input from a microphone that is connected
to the computer and to edit or mix sound stored on a disk. Most of the sound cards are manufactured to be
integrated into PCI expansion slots.
Graphics Card (Display Adaptor): A graphics card is an expansion board that helps us to process & display
videos. Modern display adaptors contain memory, therefore many times the RAM of a computer is not used
for storing the data. Availability of memory is a major factor in determining the screen resolution and colours
that can be displayed on the monitor. Graphic cards are manufactured to be integrated into PCI expansion
slots.
PORTS
Computer Port is an interface between the computer and peripheral devices like a mouse, keyboard, monitor,
printer, speaker, ash drive, pen drive, etc. A computer port acts as a point of connection where the cable or
plug from the peripheral device can be plugged to facilitate data ow from and to the device.
A computer port is also called a communication port as it facilitates communication between the computer
and its peripheral device. Based on the type or protocol used for communication, ports can be categorized
as Serial Ports and Parallel Ports.
A serial port is an interface through which peripherals can be connected using a serial protocol that involves
the transmission of one bit of data at a time over a single communication line.
70 Touchpad Information Technology-IX

