What does search engine mean What is a search engine?

A search engine is a system that searches, sorts and classifies Internet information resources, and stores them in a network database for users to query, including three parts: information collection, information classification, and user query.

How it works. 1.Crawl:

Search engines track the links of web pages through a specific regular software, crawling from one link to another, like a spider crawling on a spider's web, so it is called a "spider" and also called a "robot". The crawling of search engine spiders is entered with certain rules, and it needs to follow some commands or the content of a file.

The page data is exactly the same as the HTML that the user's browser gets. When the search engine spider crawls the page, it also does a certain amount of duplicate content detection, and once it encounters a large amount of plagiarized, collected or copied content on the very low weight, it is likely that it will no longer crawl.

A search engine refers to a system that collects information from the Internet according to a certain strategy and uses a specific computer program, organizes and processes the information, provides users with retrieval services, and displays the information related to the user's retrieval to the user. Search engines include full-text indexing, catalog indexing, meta-search engines, vertical search engines, aggregate search engines, portal search engines, and free link lists.

The search engine classification section mentions the concept of full-text search engines extracting information from ** to build a web page database. There are two types of automatic information gathering functions of search engines. One is to search regularly, i.e. every once in a while (e.g. Google is generally 28 days), the spider search engine.

The search engine takes the initiative to send out a "spider" program to search for the Internet within a certain IP address range, and once it finds a new one, it will automatically extract the information and add it to its own database. The other is to submit a search, that is, the owner actively submits to the search engine, which sends a "spider" program to you within a certain period of time (ranging from 2 days to several months) to scan your search and store the relevant information in the database for user query. With search engine indexing rules changing a lot, unsolicited submission does not guarantee that yours will enter the search engine database, and the best thing to do is to get more external links so that search engines have more chances to find you and automatically include yours.

When the user searches for information with keywords, the search engine will search in the database, and if it finds the content that matches the user's requirements, it will use a special algorithm - usually according to the degree of matching of the keywords in the web page, the position of occurrence, the frequency, and the link quality - to calculate the relevance and ranking level of each web page, and then return these web links to the user in order according to the degree of relevance. This engine is characterized by a relatively high recall rate.

The search engine relies on a variety of technologies, such as web crawler technology, retrieval sorting technology, web page processing technology, big data processing technology, natural language processing technology, etc., to provide fast and highly relevant information services for information retrieval users.

A search engine refers to a system that collects information from the Internet according to a certain strategy and uses specific computer programs, organizes and processes the information, provides users with retrieval services, and displays the retrieved relevant information to users.

In order to make it easier for users to quickly and easily find search results in a database of raw web pages above the trillion level, search engines must preprocess the original web pages crawled by Spider. The most important process of web page preprocessing is to create a full-text index of a web page, then begin to analyze the web page, and finally create inverted files (also known as reverse indexing).

Web page analysis consists of the following steps: determining the type of web page, measuring its importance, richness, analyzing hyperlinks, word segmentation, and removing duplicate web pages. After search engine analysis and processing, the web page is no longer the original web page, but is condensed into a word-based document that can reflect the subject content of the page.

The most complex structure in a data index is the establishment of an index database, which is divided into document index and keyword index. The unique DOC ID number of each web page is assigned by the document index, and the number of occurrences, location, and size format of each WordID can be retrieved in the web page according to the DOC ID number. The result is a list of liters of WordID for the banquet.

To put it simply, it is an information retrieval system in the World Wide Web environment (including directory service and keyword retrieval).

A search engine is a technology that uses specific strategies to retrieve information from the Internet to users according to user needs and certain algorithms. The search engine relies on a variety of technologies, such as web crawler technology, retrieval and sorting technology, web page processing technology, big data processing technology, natural language processing technology, etc., to provide fast and highly relevant information services for information retrieval users.