ImageMagick and GD are software libraries which should be present on a server in order for images to appear on a given website. They permit you to carry out different tasks with the images - create, flip, resize, change colors, etcetera. These things could be done online and in real time, so if you add a static image, for example, the libraries make it possible for a thumbnail to show up on the internet site or for the image to be resized automatically depending upon the device and resolution the site visitor is using. Both ImageMagick and GD can be used with lots of web programming languages such as PHP, Perl and Python, so you don't need to stick to just one language to develop your website. They work with over a hundred formats, which includes the most widely used ones - JPEG, GIF, TIFF, PNG, and so forth.