It helps you see where your traffic is coming from, which is important for advertising purposes. If your traffic is coming from one or two specific areas, then you know to spend more time advertising your site in those areas because it works.
Google Analytics, i would said is a must to track your website traffic that allow you to know your visitors behaviour well and track how is your marketing efforts, With Google Analytics - know the quality of your site , is it high bounce rate - know where your traffic from - know your visitor preferable which where do like to stay on your page - know your visitor online behavior which what time have most visitors in your site. - know how effective your marketing campaign is with the goal, conversion rate and leads - know how to fast your site load As long you able to use smart with Google Analytics, you able to gather lot of data without surveys to help you market your business well .
A valuable analytics tool offered by Google that enables web site owners to track unique visitors to a website distinguishing between new and repeat visitors, how those visitors got to the website called traffic sources and what they did after they got there.
An awesome tool useful for any webmasters. With the data it becomes easy for you to understand your customers and their needs. Here's an awesome guide on why one should use Google Analytics - http://blog.seo-first-page.com/2012/10/5-salient-features-of-google-analytics.html
Thanks folks I got lot about Google analytics from all you replies in different angle of thinking... Here i muddled about one of my sites. This site has not indexed till now but i receive approximately 10-15 traffic everyday from organic search. How is it feasible? And i can't even track it from analytics.
Thanks buddies Everybody in here is vital one for me because everyone of you has given needed information individually... Some of you also gave some tool other than analytics. This can also do as exact as analytics tool