Adwords Editor! What is this program about?

I read in a topic here, for the Adwords Editor.. but i don't know what it is? plz give me your lights! How can i find it? How does it work, what advantages does it give?

 

Follow this link to find everything about it http://www.google.com/intl/en/adwordseditor/

 

It's basically an off line tool that allows you to build and update your account in more efficient fashion.