Use of I'm Feeling Lucky Button in Google Search

You might wondering what is the use of I'm Feeling Lucky button under the Google search box. By clicking the button, it will actually bring you the main web page of the very first of your search result. For example, if you are looking for "free software download blog", using the normal search button you will see several URLs in the first page of the result. If you use the I'm Feeling Lucky button, Google will directly goes to the main page of the number one in the search result. However, it is not advisable to use the I'm Feeling Lucky button as you never knew if the number one in search result is what you actually looking for.