If by any chance you are working on something online and you would need to get the best results in as far as traffic and user interaction is concerned you will also need to start thinking about the ROI. This is important because you will be investing heavily in the management of these websites and also marketing of the same such that you can actually get to appeal to the users more than any of your competitors. At the moment there is a tug of war between SEO and AdWords in as far as marketing is concerned and it is because of this therefore that you need to understand which one will work for you and which one will get you the best results.