Which file format is commonly used for saving vector graphics in Adobe Illustrator?

The file format commonly used for saving vector graphics in Adobe Illustrator is AI. This format is specifically designed for vector artwork and contains information about the paths, shapes, and colors that define the vector graphics created within Illustrator. It allows artists and designers to save their work in a way that preserves the scalability and editability of the vector artwork, making it ideal for future edits or adjustments.

AI files support all the features and elements that Illustrator has to offer, including layers, transparency, and complex gradients. This flexibility is crucial for professional design workflows where modifications are frequently needed.

In contrast, formats like JPEG, GIF, and PNG are primarily raster formats. They convert images into a grid of pixels, which can lead to loss of quality when scaling or editing. These formats are not ideal for vector graphics since they do not retain the vector information essential for scalability and detailed editing. Therefore, opting for the AI format is the best practice when working with vector graphics in Adobe Illustrator.