A search engine, often called a query engine or a spider, uses keywords to locate and collect information from the Web. Keywords can be one or more words and can be one or more alphanumeric strings representing an alphanumeric string or a keyword. An index word, subject keyword, title word, or topic keyword, in online data retrieval, is a keyword that captures the essence of an index topic, usually on a Web site. Index words make up a well-known controlled vocabulary for application in online bibliographic databases.
Search engine robots apply various algorithms to index the contents of Web sites. These algorithms determine not only the relevancy of each Web page to a search query but also the relevance of each keyword to the search term. The search engines use “spiders” to determine these keywords from documents stored in Web directories and indexed by human searchers through searches conducted on popular keywords or topics. The spiders use both text and hyperlinks to reach Web pages that are relevant to the subject matter of each link.
Keyword popularity is determined by a process called Google juice. Google Juice is the percentage of total search engine visits that come from each of the keywords relative to the primary keyword. For example, a Web page about chicken soup may have one or two million Google juice points, but if that page’s relative keyword is “chicken soup” then it will have a much higher Google juice point because it is listed as the first result in a relative search. Each of the pages listed first in the Google juice rankings receives traffic from the primary keyword, which increases the site’s visibility and value. The more times each of the pages is listed, the more important the site becomes to the individual user searching for content on the Internet.
What people searching for do not want to be found in just a list of links; they want to find what they are looking for, right where they are looking. To do this, search engines need to provide search results that are not only relevant to the topic but also specific to each searcher’s search. So, a Web page can rank high in the search results for a particular word or phrase, but if that word or phrase is not present in the title or tags then those visitors would miss out. The title and tags can be changed, but the content should still contain the keywords or phrases that were used to create it. This makes each page and each link unique and gives searchers a clear way to find what they are looking for.
Keyword Difficulty is determined by the quantity of searches done for each of the related keywords or phrases used to build a web page. In general, the higher the keyword difficulty rating, the more traffic there will be and the more places will show that traffic. The more traffic that shows up in the search results, the more likely people are to click on the links within the Web page. Therefore, when a Web page is built with keyword difficulty one should focus on creating a topic that will draw attention to the page and the links within it. The more attention that is drawn, the more likely the visitor will click on the links to go to the page or to another site that is associated with the topic that the Web page is built around.
Search Engine Optimization (SEO) means to make the most of each keyword or phrase and create pages that contain those keywords or phrases and get them ranked very highly in search results. Keyword ranking plays an important part in SEO because the higher a page is ranked, the better chance that the page will attract a significant amount of viewers. Therefore, the more high-ranking keywords or phrases that are used to construct a Web page, the greater the chances that the Web page will attract a substantial amount of viewers and result in a lot of backlinks. Backlinks are important because these are a measure of popularity based on other Web sites that are linked to the page. Therefore, the more links there are to a page, the more popular that the page is.