In those scenarios, all the scanner operations can be accessed by the available driver. Note: In some cases, the scanners may not have both the TWAIN and Native scanner drivers. ICA: Image Capture Application (a default Macintosh scanning utility software) driver which can perform basic scanning operations.WIA: Windows Image Acquisition is a proprietary Microsoft driver model and application programming interface (API) for Microsoft Windows Me and later Windows operating systems that enables graphics software to communicate with imaging hardware such as scanners.Native drivers are either automatically downloaded on the system or the user must download and install them manually from scanner manufacturer’s website. Native Drivers: A platform specific (Windows or OS X) driver which performs the basic scanning functionalities.Nearly all scanner software contains a TWAIN driver typically comes with an advanced GUI using which users can configure all advanced scanner settings. TWAIN is the standard interface between software programs and image-capturing devices such as scanners and digital cameras.