MOUSEA device that controls the movement of the cursor or pointer on a displayscreen. A mouse is a small object you can roll along a hard, flat surface. Itsname is derived from its shape, which looks a bit like a mouse, itsconnecting wire that one can imagine to be the mouses tail, and the fact thatone must make it scurry along a surface. As you move the mouse, thepointer on the display screen moves in the same direction. Mice contain atleast one button and sometimes as many as three, which have differentfunctions depending on what program is running.The mouse is one of the primary input devices used with todays computers.The name comes from the small shape of the mouse, which you can movequickly back and forth on the mouse pad, and the cord, which represents themouses tail. Of course, if you are using a wireless mouse, the analogy doesnot work so well.All mice have at least one button, though most mice have two or three. Somealso have additional buttons on the sides, which can be assigned to differentcommands. Most mice also have a scroll-wheel, which lets you scroll up anddown documents and Web pages by just rolling the wheel with your indexfinger.
KEYBOARDAs the name implies, a keyboard is basically a board of keys. Along with themouse, the keyboard is one of the primary input devices used with acomputer. The keyboards design comes from the original typewriterkeyboards, which arranged letters and numbers in a way that prevented thetype-bars from getting jammed when typing quickly. This keyboard layout isknown as the QWERTY design, which gets its name from the first six lettersacross in the upper-left-hand corner of the keyboard.While the design of computer keyboards may have come from typewriters,todays keyboards have many other keys as well. Modifier keys, such asControl, Alt/Option, and Command (Mac) or the Windows key (Windows)can be used in conjunction with other keys as "shortcuts" to perform certainoperations
PRINTERA printer is an output device that prints paper documents. This includes textdocuments, images, or a combination of both. The two most common typesof printers are inkjet and laser printers. Inkjet printers are commonly used byconsumers, while laser printers are a typical choice for businesses. Dotmatrix printers, which have become increasingly rare, are still used for basictext printing.The printed output produced by a printer is often called a hard copy, whichis the physical version of an electronic document. While some printers canonly print black and white hard copies, most printers today can producecolor prints. In fact, many home printers can now produce high-qualityphoto prints that rival professionally developed photos. This is becausemodern printers have a high DPI (dots per inch) setting, which allowsdocuments to print with a very fine resolution.
In order to print a document, the electronic data must be sent from thecomputer to the printer. Many software programs, such as word processorsand image editing programs include a "Print..." option in the File menu.When you select "Print," you will typically presented with a Print dialogbox. This box allows you to select the print output settings before sendingthe document to the printer. After choosing the appropriate settings, you canhit the Print button, which will send the document to the printer.Of course for the document to print, the printer must be turned on andconnected to the computer. Most modern printers are connected using astandard USB cable. However, some printers can be wirelessly connected toone or more computers over a Wi-Fi network. You can also use more thanone printer on a single computer, as long as the correct drivers are installed.