CSS stands for Cascading Style Sheets, a language that allows designers to exercise more flexibility and functionality on their Web pages.

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CSS, an essential tool for any Web designer, can be used to alter colors, layout, images, fonts, spacing and more. CSS allows designers to separate design elements (such as background images, margins and even the layout of the page) from the content of the page (such as text and photos). It also can be used to serve up multiple versions of a design for different devices.