Crawling:-1- Crawling is a process done by Google bot or any other search engine like Yahoo, Bing, Baidu etc..
2- Google bot visits your website, read and get the information on your website.
3- Crawling is when the search engine's crawlers (bots) access a webpage that is available publicly. For the most part, this only means that the bot looks at the webpage and will follow the links on the page the same way that a human would.