said the invalid links said effective links, a link is the normal search engine included but also can click on to your site. What is the link activity? We all know the principle of love Shanghai clicks it, is a website click on the number of people, it is a hot love Shanghai, love is the user, then the weight will be the site of the automatic increase keyword ranking will be in front. Link active degree of this principle is that you, your home page links clicked by the user. The more you this link is useful to the user, of course, the search engine will calculate the user on this page you stay in the long time, then you go through this page other pages. Of course, this requires a good layout of the web page, if you click on a link, users stay longer, withdrawal rate is low, so that a search engine will judge you on this link is the needs of the user, the natural keywords ranking will also link front. This is our pursuit of the chain, which is what we call the link active degree, also is our pursuit of the one click, can bring the flow of the chain.