SharePoint 2013 What does SYNC button do

Today one of my fellow SharePointer friends asked me about the SYNC button that we see on the top right in Follow bar in the new Preview site.






So What does the SharePoint 2013 SYNC button do?



The “Sync” icon in the top right corner of the page is used to synchronize the library with your computer. Once you sync a library, you can access all of the files in it from Windows Explorer and Office even if you don’t have an internet connection.

cool isn't it!