The ability to specify the number of results is available only if "Instant Search" is not enabled.
If "Instant Search" is enabled, only 10 results are displayed, regardless of this setting.
Despite its immense index, there is also a considerable amount of data available in online databases which are accessible by means of queries but not by links.
for words that Google believes to be misspelled, it provides a link to the search results using its proposed spelling), and many more.
Google's search engine normally accepts queries as a simple text, and breaks up the user's text into a sequence of search terms, which will usually be words that are to occur in the results, but one can also use Boolean operators, such as: quotations marks (") for a phrase, a prefix such as " ", "-" for qualified terms, or one of several advanced operators, such as "site:".
The exact percentage of the total of web pages that Google indexes is not known, as it is very hard to actually calculate.
Google not only indexes and caches web pages but also takes "snapshots" of other file types, which include PDF, Word documents, Excel spreadsheets, Flash SWF, plain text files, and so on.
Google has published guidelines for website owners who would like to raise their rankings when using legitimate optimization consultants.
Some of its features include a definition link for most searches including dictionary words, the number of results you got on your search, links to other searches (e.g.
Except in the case of text and SWF files, the cached version is a conversion to (X)HTML, allowing those without the corresponding viewer application to read the file.
Users can customize the search engine, by setting a default language, using the "Safe Search" filtering technology and set the number of results shown on each page.
The algorithm computes a recursive score for pages, based on the weighted sum of the Page Ranks of the pages linking to them.
Page Rank is thought to correlate well with human concepts of importance.
For instance in Switzerland any individual can force Google Inc. Since Google is the most popular search engine, many webmasters have become eager to influence their website's Google rankings.