It's free! Adobe's Photoshop's kinda expensive, but GIMP offers all the features at no cost. As long a you understand the concepts of editing photos, you can figure out how to accomplish it with very little effort. Quite powerful enough when you need something more than MS Paint.

It is downloadable software designed for rich functions such as graphical editing, image composition, drawing, and other designing functions. It helps its user to enhance their productivity by allowing the user to create variants of icons, images, etc using various tools such as airbrush, pencil, erasers, different shapes and objects such as rectangle, square, circle etc, and color palettes with a wide range of colors. It also allows user to save their designs in various file formats including JPEG, GIF, TGA, PDF, etc. A user can install plug-ins for additional advanced tools.

Gimp has most of the features of Photoshop and its completely free. This can be a lifesaver when you're working on projects and when you need to quickly edit a photo. I personally find that for someone who just needs basic features it solves my needs. I also like that the program supports numerous file types and makes it easy for me to convert files to formats that I need. It's also great for compressing images or resizing them down which tends to be an issue whenever I want to send an email or post something on a website. The software is really stable too and doesn't use up too much RAM which is nice.