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HTML is a way to specify the content of your web page, independent of how you want it to look. You use CSS to specify how you want things to look, from choice of fonts, to how links should look, to colour choices, etc.. The advantage is that you can easily make site wide changes to your style, for example changing the colour of links, by changing only the CSS.
One other component is JavaScript, which defines the behavior of your page. It can do field validation, present dynamic content, move things around, and a host of other things.
By using these three components properly, you can manage your web resources and present a consistent, unified, and professional web presence.
HTML is the structure and CSS is the style