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Atomic Design is an approach to web design developed by Brad Frost and is based on the idea that a design system is built similar to chemical elements. The advantage of this design method is that different elements can be used multiple times and the web design can be easily modified. Atomic Design consists of five elements that build on each other: Atoms, Molecules, Organisms, Templates and Pages.
A detailed introduction and explanation of the advantages of Atomic Design can be found in the original post by Brad Frost at bradfrost.com/blog/post/atomic-web-design/, as well as in the t3n blog at t3n.de/news/atomic-design-baukastensystem-721010/.