Search engine optimizations or SEO, is the process of making changes to your Web site content, structure and design so that your site appears higher up the list of search results when a computer user searches on specific keywords. For example, if your business is tree removal in the city of Ottawa, you'd probably like to be at the top of the Google search results when people search on "tree removal Ottawa". Or you'd at least like to be in the top 10. Search engine optimizations is the process that can improve your rankings.
If your search for "SEO" or "search engine optimizations", you will probably find that there are somewhere over 200 million entries on this topic. If you dig a little deeper, you'll probably realize that it's not a simple process. If you go even deeper, you will find that some companies offer guaranteed results. They'll guarantee top 10 positions for example. What isn't immediately obvious is that some of the companies offering SEO services do not operate ethically. They do not adhere to the guidelines published by the search engines and if you hire the wrong company, you could find your Web site is removed completely from the search engine results. Quite the opposite of what you're trying to achieve. So whether you optimise your site yourself or hire a company to do it, you want to be sure that it is done properly.
If you're interested in learning more about how to optimise your Web site for search engines, read How to SEO a Web Site.