New designers and developers are often confused by the difference between Adobe Photoshop and Adobe Illustrator. Although there is some overlap between the two programs, there are also some very important differences. Photoshop is for editing "raster graphics" such as JPG images. Raster graphics are best for certain types of applications, but -- when enlarged -- they often appear distorted. In contrast, Illustrator is used to create and edit "vector graphics." Vector images appear to look like other images on the surface, but the computer is actually generating these images through the use of mathematical and geometric equations. (You as the designer don't need to worry about this, but this is what's happening under the hood.) As a result, the images will not distort when they are enlarged or reduced. They scale perfectly. This makes vector graphics the format of choice for designers who are targeting high-resolution platforms such as the Apple retina display.
In order to complete this badge, you will need access to a copy of Adobe Illustrator. You can download a thirty-day trial version from Adobe, and you can also access Illustrator on any of the lab computers.