How does a search engine work, and how does search engine optimization work?

Search engine refers to a system that collects information on the Internet according to a certain strategy and uses a specific computer program, organizes and processes the information, and displays the processed information to users, so as to provide users with retrieval services.

How it works. 1. Crawl web pages.

Each independent search engine has its own web crawler. The spider crawls the web page continuously by following the hyperlinks in the web page. The crawled web page is called a web snapshot.

Due to the widespread use of hyperlinks on the Internet, theoretically, the vast majority of web pages can be collected from a certain range of web pages.

2. Handle web pages.

After the search engine catches the web page, it has to do a lot of pre-processing work before it can provide retrieval services. Among them, the most important is to extract keywords and index files. Other examples include removing duplicate pages, analyzing hyperlinks, and calculating the importance of pages.

3. Provide retrieval services.

The user enters a keyword to search, and the search engine finds a web page that matches the keyword from the index database; For ease of judgment by the user, in addition to the page title and URL, a snippet from the page and other information are provided.

SEO (Search Engine Optimization), translated into Chinese as search engine optimization, is a more popular online marketing method in recent years, the main purpose is to increase the rate of specific keywords to increase the visibility, and then increase the chance of sales. There are two types of off-page SEO and on-page SEO. The main work of SEO is to optimize web pages by understanding how various search engines crawl Internet pages, how to index them, and how to determine their search result rankings for a specific keyword, so as to improve search engine rankings, so as to increase the number of visits, and ultimately improve the sales ability or publicity ability of the technology.

There are 6 basic steps, list them for you to see: 1. Keyword analysis 2, Architecture analysis 3, Catalog and page optimization 4, Content publishing and link placement 5, Dialogue with search engines 6, Traffic analysis.

Crawling and crawling: first discover and collect web page information on the Internet;

Establishment of indexing database: Extracting and organizing information at the same time to establish an indexing database;

Ranking: According to the query keywords entered by the user, the retriever will quickly check out the document in the index database, evaluate the relevance of the document and the query, sort the results to be output, and return the query results to the user.

The basic principle of SEO optimization is actually a way to use the search rules of search engines to improve the purpose of ranking advantage. Because the vast majority of browsing users only pay attention to the first few entries in the search results when using search engines, many ** hope to influence the ranking of search engines through various forms.

SEO (Search Engine Optimization) is the English abbreviation of search engine optimization, SEO refers to the use of reasonable means to facilitate search engine indexing, so that the basic elements are suitable for search engine search principles and more user-friendly (Search Engine Friendly), so that it is easier to be included in search engines and prioritized under SEM (Internet marketing). SEO means search engine optimization in Chinese. The popular understanding is:

By summarizing the ranking rules of search engines, we can optimize your rankings in Google and let search engines bring you customers. A deep understanding is: through a set of SEO based on search engine marketing ideas, to provide ecological self-marketing solutions, so that the best in the industry to occupy a leading position, so as to obtain brand benefits.

Content + external links + internal links + SEO thinking One sentence or two is not clear.