seo

Spider - A spider is a program run by a search engine to build a summary of a website’s content (content index). Spiders create a text-based summary of content and an address (URL) for each webpage.

Robots - An automated computer program that visit websites & perform predefined task. They are guided by search engine algorithms & are able to perform different tasks instead of just one crawling task.

Crawling - Crawling takes place when there is a successful fetching of unique URIs which can be traced from valid links from other web pages.
 
Spiders are also known as crawlers, every search engine has its own crawler. The crawler of Google is called GoogleBot. They are responsible for the complete process that includes crawling, indexing of websites, processing and retrieving of results in search engine result pages SERPs.

When you hear people talk about Crawlers in the context of SEO, they are referring to the programs that search engines use to scan and analyze websites in order to determine their importance, and thus their ranking in the results of internet searches for certain keywords.
 
They are all the same and are termed differently. They are automated search engine programs that are responsible to read through various webpages and provide information to search engines. They are also responsible to provide cache certificate for a successful crawl of a webpage.
 
Hi,
Spider - The browsers are like a program and to download the web page.

Crawler – The program is automatically to follow the links are web page..

Robots - It had automated computer program can visit websites. It will guided by search engine algorithms It can combine the tasks of crawler & spider helpful of the indexing the web pages and through the search engines.
 
Spider - A spider is a program run by a search engine to build a summary of a website’s content (content index). Spiders create a text-based summary of content and an address (URL) for each webpage.
 
Spider - The browsers are like a program and to download the web page.

Crawler – The program is automatically to follow the links are web page.

Robots - An automated computer program that visit websites & perform predefined task.
 
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