Cloaking - A Black Hat Technique

I never tried any of black hat SEO technique yet.....

Cloaking is a black hat technique which involves displaying different pages to search engines than to people.

Traffic exchange sites use a Blackhat technique.

Cloaking is another black hat technique. This is when the content presented to the search engine spider is different to that presented to users.

Google hates clocking.

Cloaking is a black hat search engine optimization (SEO) technique in which the content presented to the search engine spider is different to that presented to the user's browser. This is done by delivering content based on the IP addresses or the User-Agent HTTP header of the user requesting the page. When a user is identified as a search engine spider, a server-side script delivers a different version of the web page, one that contains content not present on the visible page. The purpose of cloaking is to deceive search engines so they display the page when it would not otherwise be displayed.

I dont have any idea about clocking,I know the black hat concept only,can anybody give me some online links which I can follow.

I never use the black hat techniques...

I have never applied that but yes I have an idea about that. It a technique where you create doorway pages to confuse search engine spider. You optimize a page for some major keywords and get that page at top in Google. After that you create another doorway page and use some other content over it like gambling or censored one. Cloaking is a way to cheat a search engine in a way when search engine spider come to a page it show different content so that it can be ranked high for some keywords but when a user comes to that page it reflects some other unexpected content.