Scanning
Scanner is a device that optically scans images, printed text, handwriting or an object and converts it to a digital image.
If you’re using a scanner and your computer is running windows, there’s a good chance you’re using the WIA scanner driver. This driver is responsible for communicating between your computer and scanner.
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Windows Image Acquisition (WIA) is Microsoft’s driver model and application programming interface (API) that enables software to communicate with imaging hardware like scanners.
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TWAIN (Windows and Mac) is another protocol which is a scanning protocol that connects scanners and applications together by providing standard interface. TWAIN allows applications to acquire images from TWAIN compliant devices (scanners, digital cameras, etc.).