In design, a library is a collection of assets, such as graphic elements, templates, styles or code snippets, that can be reused across multiple projects. Libraries can be created for a variety of design tools and software, such as Adobe XD, Figma, Sketch or Zeplin, and can be shared between designers and teams to ensure consistency and efficiency in the design process.

Libraries can include everything from logos, icons, and patterns to typography styles, colour palettes, and UI components. By using a library, designers save time and effort by not having to recreate assets from scratch, while also ensuring a cohesive and unified look and feel across different projects.