Sat Dec 22 18:03:46 PST 2018

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show up for many of the related searches, and some algorithms may see your
document as being less relevant. The key is to write naturally, using various related
terms, and to structure the page well.
Multiple Reverse Indexes
Search engines may use multiple reverse indexes for different content. Most
current search algorithms tend to give more weight to page title and link text than
page copy.
For common broad queries, search engines may be able to find enough quality
matching documents using link text and page title without needing to spend the
additional time searching through the larger index of page content. Anything that
saves computer cycles without sacrificing much relevancy is something you can
count on search engines doing.
After the most relevant documents are collected, they may be re-sorted based on
interconnectivity or other factors.
Around 50% of search queries are unique, and with longer unique queries, there is
greater need for search engines to also use page copy to find enough relevant
matching documents (since there may be inadequate anchor text to display enough
matching documents
.
Search Interface
The search algorithm and search interface are used to find the most relevant
document in the index based on the search query. First the search engine tries to
determine user intent by looking at the words the searcher typed in.
These terms can be stripped down to their root level (e.g., dropping ing and other
suffixes
and checked against a lexical database to see what concepts they represent.
Terms that are a near match will help you rank for other similarly related terms.
For example, using the word swims could help you rank well for swim or
swimming.
Search engines can try to match keyword vectors with each of the specific terms in
a query. If the search terms occur near each other frequently, the search engine
may understand the phrase as a single unit and return documents related to that
phrase.
WordNet is the most popular lexical database. At the end of this chapter there is a
link to a Porter Stemmer tool if you need help conceptualizing how stemming
works.