Understanding Google trends

Google Trends is a tool from Google Lab.This is the tool for compare the keyword interest in entire world internet users.It shows a chart to display the number of users since 2004.You can see as extra features Top 10 results in Searchers Regions(Country) , Cities and Languages.Those are very useful to plan a web site or write a blog for targeting online marketing.
You may use following options to use Google trend.

1.To compare the keywords(up to 5 keywords)
Use a “,” to separate your keywords.
Eg :- If you want to see the results of words “java tutorials” and “free ebook”
Use java tutorials,free ebook query

2. To see how many searches contained
Use a “|” to separate your keywords.
Eg :- If you want to use “java” and “C”
Use java | C query

By the way you can see the what people are searching for on Google today in Hot trend.
So those of the tools are very useful to a web master.When you plan a new web site or blog, you can get a basic idea about “What people want in internet?” , “who are they” and “Where are they come from?”.
Therefore you can optimize your content in the site or blog.