Cloud print allows you to print files from your phone to your printer.
In order to do this it uses the new Google Cloud Print service you should configure your pc following this guide: http://www.google.com/landing/cloudprint/
NEW: if you have an Cloudprint ready printer (Epson, Kodak etc) or HP E-Print enabled printer you don't need your pc to be on, for other printers your pc needs to be.
This App has good reviews and I can recommend it personally as working with my LG Optimus phone and Samsung Galaxy TAB to my HP ePrinter ;)
Via Heath Sawyer