Search Engine Marketing, (SEM), is a form of Internet marketing that seeks to promote websites by increasing their visibility in search engine result pages (SERPs) through the use of paid placement, contextual advertising, and paid inclusion. Depending on the context, SEM can be an umbrella term for various means of marketing a website including SEO, or it may contrast with SEO, focusing on just paid components.
Major SEM Tools
There are four categories of tools to help you optimize websites.
1. Keyword research and analysis: (a) Make sure the site can be indexed in the search engines; (b) find the most relevant and popular key terms and phrases for the site and its products; and (c) use those key phrases on the site in a way that will generate and convert traffic.
2. Website saturation and popularity: show how much presence a website has on search engines through the number of pages of the site that are indexed on each search engine (saturation) and how many times the site is linked to by other sites (popularity). It requires your pages containing those keywords people are looking for and ensure that they rank high enough in search engine rankings. The followings are major tools measuring various aspects of saturation and link popularity: Link Popularity, Top 10 Google Analysis, and Marketleap's Link Popularity and Search Engine Saturation.
3. Back end tools (including Web analytic tools and HTML validators): Web analytic tools can help you to understand what is happening to your website and measure your website's success. They range from simple traffic counters to tools that work with log files and to more sophisticated tools that are based on page tagging. These tools can deliver conversion-related information. Validators check the invisible parts of websites, highlighting potential problems and many usability issues ensure your website meets W3C code standards. Try to use more than one HTML validator or spider simulator because each tests, highlights, and reports on slightly different aspects of your website.
4. Who Is tools: show you who owns and operates various webites, can provide valuable information relating to copyright and trademark issues. Useful tools include Who Is Source, ARIN. Read a competitor's source code to look for hidden clues, Use Web analytics tools to find out more about your customers, Use the source code and Who Is tools to research legal issues.