what is crawling?

Crawling process is a final process of through which Google gives final results for your website or blog. This is a process execute by search engine spiders when searching for relevant websites on the internet.
 
Nofollow links attributes do not allow search engine bots to follow link

Dofollow links allow google (all search engines) to follow them and reach our website
 
Rel Dofollow – All three above links are dofollow, which means if a link doesn't have a rel attribute then it's a dofollow link. On the other hand, a nofollow link must have been marked as REL No follow tag. Both the above links are nofollow. For them the Rel tag should be set as “nofollow”
 
Nofollow links attributes do not allow search engine bots to follow link.That means if the website owner is linking back to you with nofollow attributes, it does not pass on link juice.Only Humans will be able to follow the links. Though some time back Google made it clear that they don’t consider nofollow link attributes but weightage of such links are really less. Even though, it’s a good practice to use Nofollow link attribute to those link, where you don’t want to pass link-juice.

Dofollow links allow google (all search engines) to follow them and reach our website. Giving us link juice and a backlink. If a webmaster is linking back to you with this link both Search Engine and Humans will be able to follow you. The best way to give someone dofollow love is allowing keyword in the anchor text. This means when you are linking to any website or page, use the targeted keyword as anchor text.
 
Web Crawling is the process of search engines combing through web pages in order to properly index them. These “web crawlers” systematically crawl pages and look at the keywords contained on the page, the kind of content, all the links on the page, and then returns that information to the search engine’s server for indexing. Then they follow all the hyperlinks on the website to get to other websites. When a search engine user enters a query, the search engine will go to its index and return the most relevant search results based on the keywords in the search term. Web crawling is an automated process and provides quick, up to date data.
 
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