If you have been working in the office environment, you should have heard of this brand. When someone tells you to go "xerox" a document, they are actually telling you to photocopy the document at the Xerox machine. Yes, Xerox machine means photocopy machine. The brand is so famous for their photocopy machines that when someone says "photocopy", the image of a Xerox machine comes into mind. Yes, they do sell a huge variety of black & white and color laser printers, multi-functional machines, photocopiers, digital production press systems and everything to do with printing. Now they are advancing to digital document management as everywhere, everyone is going green. Of course, they do face stiff competition from Canon, Ricoh, Konica and Sharp, who are also heading to digital document management. By the way, Xerox Corp revenue was over 21 billion in 2010. That is how big this corporation is.