SEO is the active practice of optimizing a web site by improving internal and external aspects in order to increase the traffic the site receives from search engines. Firms that practice SEO can vary; some have a highly specialized focus, while others take a more broad and general approach. Optimizing a web site for search engines can require looking at so many unique elements that many practitioners of SEO (SEOs) consider themselves to be in the broad field of website optimization (since so many of those elements intertwine). We cover all of those aspects.
Why can't the search engines figure out my site without SEO help?Search engines are always working towards improving their technology to crawl the web more deeply and return increasingly relevant results to users. However, there is and will always be a limit to how search engines can operate. Whereas the right moves can net you thousands of visitors and attention, the wrong moves can hide or bury your site deep in the search results where visibility is minimal. In addition to making content available to search engines, SEO can also help boost rankings so that content that has been found will be placed where searchers will more readily see it. The online environment is becoming increasingly competitive, and those companies who perform SEO will have a decided advantage in visitors and customers.

Five Quick Seo Tips from Branding Leader
Be bold. Use the <b> </b> tags around some of your keywords on each page. Do NOT use them everywhere the keyword appears. Once or twice is plenty.
Deep linking. Make sure you have links coming in to as many pages as possible. What does it tell a search engine when other web sites are linking to different pages on your site? That you obviously have lots of worthwhile content. What does it tell a search engine that all your links are coming in to the home page? That you have a shallow site of little value, or that your links were generated by automation rather than by the value of your site.
Titles for links. Links can get titles, too. Not only does this help visually impaired surfers know where you are sending them, but some search engines figure this into their relevancy for a page.
Not anchor text. Don't overdo the anchor text. You don't want all your inbound links looking the same, because that looks like automation - something Google frowns upon. Use your URL sometimes, your company name other times, "Gumbo Pudding Pop" occasionally, "Get gumbo pudding pops" as well, "Gumbo-flavored pudding pops" some other times, etc.
Site map. A big site needs a site map, which should be linked to from every page on the site. This will help the search engine robots find every page with just two clicks. A small site needs a site map, too. It's called the navigation bar. See how the second navigation bar at the bottom of Last Minute Florida Villas is like a mini-site map? Titles for links. Links can get titles, too. Not only does this help visually impaired surfers know where you are sending them, but some search engines figure this into their relevancy for a page.