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Graphics card - The quality and speed of graphics card your PC desktop computer will require depends on what you will be doing with it. If you are planning on watching movies or playing games, you will need a higher quality graphics card than if you will just be typing word documents or browsing the internet all day. The graphics card is important because it helps the computer run at a good speed with more complicated graphics and determines the quality of the picture you get on your screen. Keyboard - The type of keyboard you use is important for many reasons. The keyboard is what allows you to type different characters into your computer and allows you to make different selections as well. The quality of your keyboard will determine how long it lasts, as well as how easy and comfortable it is to type on. If you type a lot or have wrist or hand problems, you may want to consider getting an ergonomic keyboard. It will ease the tension on your hands and wrists and reduce the risk of getting carpal tunnel syndrome. Mouse - The mouse is also an important component to a PC desktop computer. It allows you to move the pointer around and click to make a selection or perform different commands that pop up on the screen. You can get a mouse with a roller ball, or with a laser so that you don't have to worry about the ball getting dirty and sticking or falling out. You can also get a mouse with either a cord or wireless option. PC desktops are important in many peoples lives and are used for many different reasons. They are used in most offices around the world, and they are also used for fun to type documents, browse the internet, and connect with the people that we know as well as those we don't know via the internet.