Never assume that new users on your website will know what action they are supposed to take to achieve the purpose for which your site exists.
If you have an eCommerce site, you want them to click the “Add to Cart” button. If your site is there to generate sales leads you want them to click the “Contact Us” button. If you run a social networking website your goal should be for them to click “Join Now”. These are your “Call to Action” buttons and they should be big and bold. So what makes a good Call to Action?