Designed around users' social circles (called +Circles), Google attempts to more closely mirror "real life" compared to competitors like Facebook. It lets users selectively share with specific groups within given circles, rather than sharing with all their social connections at once.
Reuters explains some of the integration plans for Google+:
Nearly all Google websites, such as its flagship Google.com search engine and the Google maps site, will have a special toolbar running across the top of the page. The toolbar has an icon of your face alongside your name in the top left, to remind you that you are currently logged on to the Google Plus network. Click on your name and you can quickly log off the network, or switch to incognito mode.
Learn more about Google+ below and try a demo of it here.