When there is no scanner nearby. you can use it to scan not only documents in sight, but also books, whiteboards, receipts, business cards, posters, coupons, ...etc. as PDFs.
Besides, you can draw lines or annotate on the scanned PDF later.
It auto detects document edges and curve surface in a picture, dewarp curve surface, correct perspective distortion, remove shadows and brighten it up to produce a clear and sharp document, especially useful in a Low-Light environment.