In other words the Webmaster tools gives all tools and gives every possible ways to manage your website and make it SEO friendly.
The Webmaster tool, keeps track of the website and keeps these data for your website. Checks and keeps track of the website from where it was visited and how many clicks were made from the search listings. Now this information is very helpful to you to analyze your website and to know where and how the website is making its name.
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By now you should know how important is the SEO, and whats are the ways to improve the SEO ranking. If you have not yet known as to what is the SEO is, please refer to this link to understand more about the SEO and what is it.