Back end tools, including Web analytic tools and HTML validators, provide data on a website and its visitors and allow the success of a website to be measured. They range from simple traffic counters to tools that work with log files and to more sophisticated tools that are based on page tagging (putting JavaScript or an image on a page to track actions). These tools can deliver conversion-related information. There are three major tools used by EBSCO: (a) log file analyzing tool: WebTrends by NetiQ; (b) tag-based analytic tool: WebSideStory's Hitbox; and (c) transaction-based tool: TeaLeaf RealiTea. Validators check the invisible parts of websites, highlighting potential problems and many usability issues and ensuring websites meet W3C code standards. Try to use more than one HTML validator or spider simulator because each one tests, highlights, and reports on slightly different aspects of your website.

I want you to do some SERP investigation, meaning perform a search query in Google, see what comes back to you, and then figure out from there what Google believes to be relevant to the keywords searches. What does Google think is the content that will answer this searcher's query? You're trying to figure out intent, the type of content that's required, and whatever missing pieces might be there. If you can find holes where, hey, no one is serving this, but I know that people want the answer to it, you might be able to fill that gap and take over that ranking position. Thanks to Gaetano, @gaetano_nyc, for the great suggestion on this one.

While SEO allows you to optimize your website for a greater chance in appearing higher in search results, and online advertising allows you to send promotional content to the target audience of your choosing, SEM combines both benefits as your content is both optimized for higher search rankings and is placed primarily in front of audiences who are most likely to convert when they click on your ads.