Google Trends: What Is Google Trends?
Google Trends is a search trends feature that shows how frequently a given search term is entered into Google’s search engine relative to the site’s total search volume. Google Trends can be used for comparative keyword research and to discover event-triggered spikes in keyword search volume.
For each keyword, Google Trends provides the search volume index, geographical information about search engine users, and the frequency your keyword appears in Google News.
Google Trends also displays the most popular searches on social networks such as Twitter.