AI (Adobe Illustrator Artwork) is a proprietary vector graphics format developed by Adobe Systems. It is the native file format for Adobe Illustrator and is widely used by graphic designers for creating logos, illustrations, and print layouts. AI files are scalable without loss of quality and support complex vector paths, layers, and typography. Sample AI files are used to test vector graphic compatibility in design software. Developers use them to verify that their applications can import or preview Illustrator files correctly. They are also used to test the preservation of vector paths and layer structures when interoperating with other Adobe Creative Cloud applications.