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operate.
• drive, Zip drive, keyboard, mouse, scanner, monitor, speakers and printer.
• An operating system loads automatically and controls just about
everything on your computer.
• An application program helps you accomplish a certain task, such as
writing a certain task, such as writing a letter, browsing the Internet, or
playing a game.

• A programming language is a vocabulary and set of grammatical rules for
instructing a computer to perform specific tasks.
• Main components visible from the outside of the system unit may include
the floppy drive, CD-ROM or DVD.
• Main components inside the system unit may include the motherboard,
CPU (Central Processing Unit), Random Access Memory (RAM), ROM-

BIOS, expansion slots and cards, and PCMCIA cards in laptops.
• Ports on the back of a computer include: keyboard, mouse, serial or COM,
printer or parallel, USB, video or monitor, line in, line out, microphone,
joystick or game, phone or modem, Ethernet or network, etc.
• Computer performance is determined by CPU speed, amount of memory
or RAM, the type and speed of the video card, the hard disk speed, free
space, and fragmentation, and the number of programs running at the same

time.