TWAIN is a widely-used program that lets you scan an image (using a scanner ) directly into the application (such as PhotoShop) where you want to work with the image. Without TWAIN, you would have to close an application that was open, open a special application to receive the image, and then move the image to the application where you wanted to work with it.

Scanners – Scanners are used to convert paper documents to electronic images. There is a niche of scanners known as document scanners designed specifically for document imaging. They typically run faster and are slightly more expensive than flatbed scanners.

Image Capture- Capture is the most basic building block of any imaging application. It is the process of converting hard copy paper documents to an electronic format. Typically this is done through the use of a scanner, which outputs a TIFF Group 4, JPEG, or a PDF formatted images.