Summary
Monitoring search engine market share news can be helpful in pursuing sound SEO choices. Although new search engines will continue to crop up from time to time, SEO activities need only focus on a select few primary search engines: Google, Bing, and Yahoo!. If your site needs to rank well in the Asia–Pacific region, you may also want to consider a regional search engine such as Baidu or Yandex.
After examining the big players, you learned about the different types of search engines, including first tier, second tier, regional, topical (vertical), web spider (based), meta, and hybrid search engines.
We also talked about the different web directories before turning our attention to search engine anatomy. In that section, we explored different web spiders, the search engine query interface, and search engine algorithms. We also created a spider viewer script. At the end of this chapter, we covered Google’s PageRank in more detail.
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