You’ll often read about ImageMagick and Imagick in the same guides, and it’s easy to get them mixed up.
ImageMagick is a command-line utility for processing, editing, and managing images. It is available for all different kinds of operating systems, and you can use it as a standalone application or a library.
Meanwhile, Imagick is a PHP extension of ImageMagick. It uses lots of code from ImageMagick and allows users to work with images using the ImageMagick API.
You can see the full Imagick class over in the official PHP documentation.