Type: Vector Image Files
Acronym: Adobe Illustrator File
Opens With: Adobe Illustrator CS5
Drawing created with Adobe Illustrator, a vector graphics editing program; composed of paths connected by points, rather than bitmap image data; commonly used for logos and print media.
Since Illustrator image files are saved in a vector format, they can be enlarged without losing any image quality. Some third-party programs can open AI files, but they may rasterize the image, meaning the vector data will be converted to a bitmap format.