Image groups in KatanaPIM are collections of image tiles that are organized based on specific criteria. These groups allow users to categorize and manage images in a structured manner. For example, an image group can be created for a particular product category (like suitcases), a sales channel, or based on image types (such as lifestyle images, product detail shots, etc.). By using image groups, users can ensure that each product has a consistent and comprehensive set of images that cover all necessary angles and details, enhancing the product's presentation and information on the platform.