Creative Cloud Libraries are a relatively new feature in Illustrator, and can also be found in InDesign and Photoshop. Libraries (see Figure 10) are a powerful feature that lets you create, categorize, share, and store your favorite colors, brushes, text styles, graphics, and vector images in one easily accessible place. That Library content can be accessed on any machine or mobile app that supports Libraries, as long as you log in with the same Adobe ID.
Figure 10 A Library in Illustrator
I love using these Libraries because you can easily share artwork, text formatting, and colors between applications and between your Illustrator documents.