Royalty-free images are images that you can use for various purposes without having to pay royalties or license fees each time you use them. These images are typically available for a one-time fee, and once you've purchased the license, you can use the image multiple times without any additional cost. The "royalty-free" term doesn't mean the images are entirely free; it means you pay for the license only once and can then use the image according to the terms specified by the license.