The main purpose of Google Search is to hunt for text in webpages, as opposed to other data, such as with Google Image Search.
Google search was originally developed by Larry Page and Sergey Brin in 1997, These include synonyms, weather forecasts, time zones, stock quotes, maps, earthquake data, movie showtimes, airports, home listings, and sports results. There are special features for numbers, including ranges (70..73), and language translation of displayed pages.
The webpages of "Google Search Basics" describe each of these additional queries and options (see below: Search options).
Google's Advanced Search web form gives several additional fields which may be used to qualify searches by such criteria as date of first retrieval.
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.
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.
All advanced queries transform to regular queries, usually with additional qualified terms.