AI stands for Adobe Illustrator format, and, as its name suggests, it is the format used for the documents generated natively by Adobe Illustrator. These single-page vector drawings can be easily magnified without losing any image quality.
In order to be able to modify AI files, users need to use Adobe Illustrator or to choose one of the graphic editors that support AI format.
However, not all compatible applications will offer users the possibility to correctly manage the image layers.
All AI editors will allow users to apply graphic effects onto the pictures or to overlay watermarks.
Moreover, some of these software solutions can be used to export AI the adjusted images to other file formats.