A mosaic is a group of images or point clouds that you want to view together. Each of the images or point clouds that make up a mosaic is called a tile.
You can manage the tiles in a mosaic to add tiles, remove tiles, or change the order of tiles. For raster images, you can also crop tiles.
For raster mosaics, you can perform the same manipulation operations that you perform for single images. For example, you can crop or despeckle a raster mosaic.