<ul><li>CSS-in-JS is a styling approach that involves writing CSS within JavaScript files, typically inside React components, using libraries like styled-components or Emotion.</li><li>Libraries like styled-components and Emotion generate unique class names, inject CSS rules dynamically, and support dynamic styles that react to props or themes.</li><li>CSS-in-JS offers benefits such as scoped styles, dynamic styling, code co-location, theming support, and eliminates the need for class naming conventions.</li><li>Popular CSS-in-JS libraries include styled-components, @emotion/styled, vanilla-extract, and Stitches. CSS-in-JS is recommended for component-based architectures and projects requiring dynamic styles or runtime customization.</li></ul>

How CSS-in-JS Works and Why It Matters

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