先决条件 – 搜索引擎优化 (SEO) |基本
1.爬行：
爬网是搜索引擎派出一组机器人(称为爬虫或蜘蛛)来查找新更新内容的发现过程。
2. 索引：
索引是将他们在索引中找到的信息存储在一个巨大的数据库中的过程，该数据库包含他们发现的所有内容，并且看起来足以为搜索者提供服务。
索引和爬网的区别：
| S.No. | CRAWLING | INDEXING |
|---|---|---|
| 1. | In the SEO world, Crawling means “following your links”. | Indexing is the process of “adding webpages into Google search”. |
| 2. | Crawling is the process through which indexing is done. Google crawls through the web pages and index the pages. | When search engine crawlers visit any link is crawling and when crawlers save or index that links in search engine database is called indexing. |
| 3. | When google visits your website for tracking purpose. This process is done by Google’s Spiders or Crawlers. | After crawling has been done, the result gets put on to Google’s index (i.e. web search), which means Crawling and Indexing is a step by step process. |
| 4. | Crawling is a process which is done by search engine bots to discover publicly available web pages. | Indexing means when search engine bots crawl the web pages and saves a copy of all information on index servers and search engines show the relevant results on search engine when a user performs a search query. |
| 5. | It finds web pages and queues for indexing. | It analyses the web pages content and saves the pages with quality content in index. |
| 6. | It crawls the web pages. | It performs analysis on the page content and stores it in the index. |
| 7. | Crawling is simply when search engines bots are actively crawling your website. | Indexing is the process of placing a page. |
| 8. | Crawling discovers the web crawler’s URLs recursive visits of input of web pages. | Indexing builds its index with every significant word on a web page found in the title, heading, meta tags, alt tags, subtitles and other important positions. |