<ul data-eligibleForWebStory="true">CSS, or Cascading Style Sheets, is essential for styling HTML elements on a webpage.CSS adds colors, spacing, layouts, and animations to the structure provided by HTML.CSS syntax involves selectors, properties, and values.There are three ways to add CSS: inline, internal, and external; external linking is the best practice.Understanding the CSS Box Model is crucial, consisting of content, padding, border, and margin.Applying 'box-sizing: border-box;' in CSS resets makes layout calculations easier.Learning CSS with a solid foundation and experimenting leads to creating visually appealing web pages.