Your channel and Google+
Over the past year, we’ve been encouraging YouTube users to connect their YouTube channel with a Google+ profile or page to access new features. Most active YouTube channels are already connected to Google+.
Why do I need to connect my channel?
We've released several new features that integrate YouTube and Google functionality, and are continuing to build more. In order to take advantage of these new features, your channel needs to update to our Google-wide identity system, which works both on YouTube and also across the rest of Google. This identity system is powered by Google+.
How will this change my appearance on YouTube?
As always, you're in control of how you're seen publicly.
You can keep your current YouTube username, choose your full name, or even choose a new name for your channel. If you want to keep using a different name on YouTube than on other Google services, you can still do that with the Google identity system.
Once connected, your YouTube channel will share its name and avatar with the Google+ profile or page. Any name and photo changes will apply to both the Google+ profile or page and the YouTube channel. Your channel URL (i.e. www.youtube.com/user/username) will not change.