A Buffer refers to the using a part of your computer's memory to relieve the burden on a specific component, such as your keyboard or printer. For example, if you press all of the keys on your keyboard at once, on a slow computer, the letters would appear on the screen slower than you've typed them. Since the computer isn't able to quickly process all keys pressed, the keys you've pressed are actually stored in a buffer and fed to the computer at a slower rate it can handle. This way, your keystrokes aren't actually lost. Note that your computer will beep when the buffer becomes full, telling you keys pressed thereafter will be forgotten. Buffer is similar to Cache.
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