Optical Character Recognition lets you convert images with text into text documents (using automated computer algorithms). The text information is attached to PDF, which is then searchable.
The option to scan a document as PDF allows you to create a PDF file directly from a paper document. This feature can save a lot of time, especially if you have many multi-page documents to scan.
Auto Scan Mode detects the type of document being scanned – Photo, Post Card, Business Card, Magazine, Newspaper, Document – and automatically crops and saves files to PDF or JPEG format based on image type.
If you have lots of long documents, a higher capacity might be of interest.
An automatic document feeder (ADF) allows for multiple pages to be copied or scanned at one time. You should consider an ADF if you intend to scan documents regularly.