Cloaking in SEO

Cloaking is a technique of black hat seo. The content of the website gets changed depending upon the surfer's identity. Generally it presents different version of web page contents from of search engines to search engine robots and human visitors based on their browser's user agent or IP address.
Cloaking is a deceptive method that has to be avoided for the long term results of seo.


Dangling links

A dangling link is a link to a page that has no links going from it, or a link to a page that Google hasn't indexed. In both cases Google removes the links shortly after the start of the calculations and reinstates them shortly before the calculations are finished. In this way, their effect on the PageRank of other pages in minimal.