Google Trends can tell a Web professional a lot about what people are searching for.
This can help marketers create in-demand content, as well as make other business decisions. Website Magazine used Google Trends to see how much the following particular search terms have been entered to test the popularity of different SEO strategies in 2015 (comparing January 2015 searches with November 2015 searches).
Content Marketing - Up
Local SEO - Up
Keyword Research - Down
Guest Blogging - Down
Technical SEO - Up
Social Media SEO - Down
While this is just a fun look at the volume of searches for different SEO strategies, Google Trends data is pretty telling in regard to what is hot and what is not.