In order to rank well in terms of SEO, your site needs to have informative content, help visitors find the information they need, and effectively showcase your products and services. Therefore, it follows logically that the more traffic you attract to your site, the greater the number of people your first rate content will be likely to convert into customers.
This also helps to create a virtuous circle, in that the longer your high quality content keeps users’ attention and they remain on your site, the better your site will rank in searches, and so the two elements work hand in hand.