Adobe Illustrator Artwork (AI) is a proprietary file format developed by Adobe Systems for representing single-page vector-based drawings in either the EPS or PDF formats. The. ai filename extension is used by Adobe Illustrator.\n\nAnswer this question based on the passage: what is the file extension for adobe illustrator?
Let's be accurate as possible and think first.
. ai
The relevant information is: The.

ai filename extension is used by Adobe Illustrator.

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Therefore, the answer is . ai