The Mosaic Creation category is for software that makes Photo-mosaics, they are images that are formed from a series of smaller images.

The software used to make photomosaic sorts thousands of tiny images by color, density, internal shapes, and light and arranges them so that when viewed from a distance, they combine to form a single larger image.

Other names for photomosaic are image montage, mosaic creation or photo-tiled image.