The Front of a computer and Peripheral devices

The system unit or computer case is that plastic box that sits under your monitor or desk and is covered with slots, buttons, and lights. computer cases come in several shapes and sizes. Older computers often have the horizontal desktop case, which has gradually been replaced by the verical tower case. Manufacturers are now phasing out the tallest towers because the compact size of the smallest tower, known as a mini-tower, is attractive to consumers. everything outside of and connected to the system unit is called peripherals. you can add dozens of peripherals and accessories to make it more useful and fun. common peripherals include printers, scanners, external hard drives, CD-ROM drives, and digital cameras. Many peripherals are considered to be input devices, because they allow you to talk to your computer by inputting information. other peripherals are output devices, because they let your computer talk back to you. One more thing: all peripherals are considered to be part of a computer's hardware.