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Typically a graphical style where there are one two colors. (A bit can be either on or off, so two options) Commonly black and white, but can be any combination depending on the style the creator is trying to accomplish. 

Desktop pets are small virtual companions that can roam, interact, and entertain you while you work or play on your computer. These digital pets often come with unique animations, behaviors, and features, providing a charming and interactive element to your computer.