What is the criteria adopted by the Google about page ranks?

[businessman1927]

What is the criteria adopted by the Google to increase and decrease the page rank of a website? Is this depends on lot of traffic or back links or some others?

 

[JennyRipley]

May be domain ages,keywords on page and so on ..

 

[sreglobal]

We know that Google update all website 4 times in a year...It analysis new content and high page rank sites by 2 way or 3 way link exchange...Keep it up.