Most of the photos, pictures, clip art and images on this site have been released into the public domain. This means that you are free to download them and use the photos for any use including commercial purposes. Unless the source is listed under one of the "free to download" headings, then they are only free for personal use or simply free to look at.
Free image sites particularly don't like it when you use them to make your own collection for commercial use (i.e. a collection to sell). However, the ones listed for commercial use allow that the images be used in products and promotions (i.e. a website banner, or as an illustration for a bo