What Does it Mean to Sign Into Chrome?

Signing into Chrome with your Google account credentials is optional. But if you do, Chrome Sync saves your personalized browser features and allows you to access them from a Google Chrome browser on any computer.

Exactly which of you settings you want to sync across all your devices is optional. You’ll find your Chrome Sync Settings here. They look like this:

Here’s a promo video from Google explaining it a bit more.