If you are planning a website project then you will want beautiful photos for your website, if you have plenty of your own then that is great, but you may feel you need to seek images to decorate your website better. In that case there are many sources of Royalty free stock images, in most cases you will need to purchase photos but there are also plenty of great photos that are totally free to use, including for commercial web usage.
As in this image, all that the creator requires for free use is to properly credit themselves and the source. For purchased images the usual licence allows commercial use without any credit.
If you are involved with a design project with myself I will be able to guide you through the process of searching and selecting the best images for your project.