ImageMagick and GD are software libraries which should be present on a server for images to appear on a specific website. They allow you to perform a variety of tasks with the images - create, flip, resize, change colors, and so on. These things can be done online and in real time, so if you include a static image, for example, the libraries make it possible for a thumbnail to appear on the site or for the image to be resized automatically based on the device and resolution that the site visitor is using. Both ImageMagick and GD can be used with various web programming languages including PHP, Perl and Python, so you don't have to stick to just one language to create your site. They work with over one hundred formats, which includes the most frequently used ones - JPEG, GIF, TIFF, PNG, and so forth.