Google Trends data
If you want to look into a keyword further, you can click on the "trend" icon to open up Google Trends data. Just hover over a row to make the icon appear:
Here you'll see:
How this keyword is trending
What keywords Google thinks are relevant
Demographic data about the keyword
Google's related keywords can be used as an additional source for finding great keywords. Click on the "right" arrow to get even more keyword ideas.