Paint Shop Pro is a software that can be used to edit and create Images to use in many different programs. It supports many of the popular graphic types, including CompuServe (GIF), JFIF Compliant (JPEG), Macintosh PICT (PICT), Windows Bitmap (BMP), Photoshop (PSD), and Portable Network Graphics (PNG, my favourite) as well as less familiar file types. You can also use Paint Shop Pro to convert Images from one format to another. It is much facile than Adobe Photoshop, in my opinion. Often known as PSP.
Photoshop user: it took me 7 years in photoshop for my skills to improve.
Paint shop pro user: woah really? it only took me 4!