Adobe Photoshop, colloquially known as just Photoshop is Adobe's flagship photo editing program. Make a solid guess on what it does.

Info

Photoshop is a photo editor, the most advanced one around pretty much. It can export to basically anything. Project files are *.PSD.

Usage

Like all Adobe software, Photoshop is a paid program. If you're looking for something free, GIMP is your best bet.