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A programmable machine that performs high-speed processing of numbers, as well as of text, graphics, symbols, and sound. All computers contain a central processing unit that interprets and executes instructions; input devices, such as a keyboard and a mouse, through which data and commands enter the computer; memory that enables the computer to store programs and data; and output devices, such as printers and display screens, that show the results after the computer has processed data.When the computer loads your file from your hard drive - where does that information go? It makes a copy of the information from the hard drive and places it in RAM. For speed. Information in RAM is stored based on electrical signals... so to change information simply requires sending a different electrical signal to the chip. This happens very quickly. Remember, the hard drive is a physical object that is spinning. It takes time to start it spinning, and move the hard drive "head" to the right position. And computer cables are very important.if your computer have cabling problem you can choose very good and cheaper cables.and more ,HDMI and DVI cable item. Let's say you are typing in a Term Paper in your Word Processor. Every key you press on the keyboard becomes part of your Term Paper. You don't realize it but, every letter you press has to be remembered by the computer. It accomplishes this by saving those keys in RAM. It happens so quickly, you don't even notice it. So Before making any choice one should consider its necessities and comfort. There are various saaccessoriesto les vendors who make excellent pitch to convince for buying the zmake their money but one should act smart and consult other vendors or online manufacturers. Buy thacomputer itemh you require most and make sure to buy from a reliable place.