I think everyone knows Google, the most known company that starts with a search engine. Every day, over 2 million search queries are being sent to Google and you get the things you want because they have special algorithms to find out the important links.
Have you wondered how can Google does that? In here I’m going to tell you how. It’s a number called PageRank that defines the importance of a page and the result is sorted according to the PageRank.
A PageRank of a page is actually the probability of a user clicking the link. Every page will be given a same PageRank when Google first indexed them. Then each time Google indexed a page, it’ll recalculate the PageRank of every page by the following rules:
- If the page has been linked by other sites, their PageRank will transfer to the page.
- Then, if there’s more page linked to the current page, a PageRank of the PageRank of the page divided by the number of link to the current page will be transferred.
Therefore, the formulae of a page’s PageRank is:
u denotes the current page,
v denotes the pages that linked to the site
L() is the amount of links to site
This formulae helps Google to choose what is useful to the users. Also, the higher the number, the more likely a user will go to your site. This makes PageRank an important mark of how popular your site will be.