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Cascading Stylesheets — or CSS — is the first technology you should start learning after HTML. While HTML is used to define the structure and semantics of your content, CSS is. used to style and lay it out. For example, you can use CSS to alter the font, color, size, and spacing of your. content, split it into multiple columns, or add animations and other decorative features. This is because HTML is far more interesting and much more fun to learn when you apply CSS.