Google was founded in 1997 and has rapidly developed into the largest search engine in the past few years. It also provides background web page query services to other directory indexes and search engines such as Yahoo and AOL. Currently, Google has processed 0.2 billion search requests every day! This number is also growing. Google database contains 3 billion Web files. It is a Full Text search engine.
Google provides regular and advanced search functions. In advanced search, you can limit that a search must contain or exclude specific keywords or phrases. This engine allows you to customize the number of information entries contained in the search results page. You can choose from 10 to 100 entries. Provides internal and horizontal queries. Google also provides special topic searches, such as Apple Macintosh, BSD Unix, Linux, and college searches.
Google allows search in multiple languages and provides up to 30 language options on the operation interface, including English and major European languages (including 13 Eastern European languages) japanese, Simplified Chinese, Traditional Chinese, and Korean. You can also select from up to 40 country-specific engines.
Search rules: when you search by keyword, the returned results contain all and some keywords. When you search by phrase, exact match is performed by default. Word Stemming is not supported) word Truncation queries. Letters are case-insensitive and all are lowercase by default.
The search result displays the webpage title, URL, and webpage bytes. The matching keywords are displayed in bold. Other special features include "Web Snapshot" (Snap Shot), that is, the archived files on the page are directly pulled from the database Cache, instead of connecting to the website where the webpage is located (images and other multimedia elements still need to be downloaded from the target website), you can determine whether to access the website after previewing the webpage content, you can also view the content of the original webpage when the webpage is deleted or cannot be connected temporarily (note: Chinese users are currently unable to use Google Web Snapshots ).
Google uses the Dmoz directory index to query classified directories. However, by default, the website is not sorted alphabetically, but by PageRank? .
Google's "Spider" program named "Googlebot" is a very active website scanning tool. Google usually sends a "spider" program every 28 days to search for new websites within a certain IP address range of existing websites. The logon cycle to Google is generally three weeks (from submitting a website to being indexed ).
