A Google trend is a tool is used to show how repeatedly an exacting search term is go through relative the total search volume athwart various regions of the world, and in various languages.It is in form of graphical representation. Represented as graph.The horizontal axis of the main graph represents time it may starting from some time in 2004, and the upright is how often a term is searched for comparative to the total number of searches, globally. Below the main graph, recognition is broken down by region, city and language. It is possible to refine the main graph by region and time period.

Google Trends also allows the user to evaluate the volume of searches between two or more terms. An additional aspect of Google Trends is in its ability to show news related to the search term overlaid on the chart showing how new events affect search popularity.

Google Hot Trends:It is a fairly recent addition to Google Trends which displays the top 100 hot searches of the past hour. It provides a 24-hour search volume graph as well as blog, news and web search results for the terms. Hot Trends has a history feature for those wishing to browse past hot searches. Hot Trends can be installed as an iGoogle Gadget. Hot Trends is also available as an hourly Atom web feed.
Google Music Trends: It was an opt-in service that display the music most listened to by users of Google Talk, in the form of the 'Week's top songs'. Trends could also be drinkable by Genre and Countries.
Google Trends API:An API to accompany the Google Trends service was announced by Marissa Mayer, vice president of search products at Google. This was announced in 2007, and so far has not been released.