Adobe photoshop can be purchased certain places online. You can also purchase the software program in the store, but it is cheaper to download off the internet.
You can color correct images, add beautiful frames, bubbles, text, coorect your photos from Facebook and Flickr, send albums to friends, manage albums upload photos...
Photoshop Elements is Photoshop but with less features, so Photoshop is better but it is professional level software. For home use or to get started Photoshop Elements is OK.
Adobe's website provides easy and often free downloads for their products, many of which are needed in today's web and business environment. See the link below for more information on downloads.