What is Google Trends and How it Helps SEO
Google Trends for Websites is a free tool that shows traffic estimates for one or more websites. It displays a traffic graph, the top ten countries of visitor origin, the top ten related websites and top ten related keywords. You can search for data from the last 30 days or the last 12 months. You can view data from specific years or months as well, for example, the data from November 2008. You can also specify data from particular geographic locations
By entering in multiple websites, you can see how they compare at a glance. This can offer some valuable insight into your website trends as compared to competitors.