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That is, a small portion of the terms observed in a large query log (e.g. > 100 million queries) are used most often, while the remaining terms are used less often individually. [13] This example of the Pareto principle (or 80–20 rule ) allows search engines to employ optimization techniques such as index or database partitioning , caching ...
In information retrieval, an index term (also known as subject term, subject heading, descriptor, or keyword) is a term that captures the essence of the topic of a document. Index terms make up a controlled vocabulary for use in bibliographic records .
• To find an exact phrase, put quote marks around your search terms. For example, use "Charlie and the Chocolate factory" to find content for the movie. You can also use hyphens to connect a phrase such as brother-in-law. • To exclude specific words in your search, type a minus sign (-) in front of the search term.
The query term1 term2 transforms the search domain twice to get those search results. For example, a bare namespace returns the pages of the namespace. The query term1 term2 regexp relies heavily on the first two terms to reduce the search domain size. All terms in a query are indexed searches unless they are a regexp.
Most search engines support the use of the Boolean operators AND, OR and NOT to help end users refine the search query. Boolean operators are for literal searches that allow the user to refine and extend the terms of the search. The engine looks for the words or phrases exactly as entered.
Keyword research is a practice search engine optimization (SEO) professionals use to find and analyze search terms that users enter into search engines when looking for products, services, or general information. Keywords are related to search queries.
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Search "folds" character families, matching similar-looking letters across alphabets, to match foreign terms. So, you don't have to type in diacritical letters, and your terms will still match. For example, a search on Citroen will also match Citroën, and Aeroskobing matches Ærøskøbing.