How can create Tag cloud...?

[hemantets]

Hello friends If you know about the tag cloud then please tell me the web 3.0 and web 2.0 .

[fixed]

If you're using Joomla, WordPress, or another content management system, then there check for a plugin. It probably already exists and will easily drop into your site.

You can also check out the wikipedia page on tag clouds (http://en.wikipedia.org/wiki/Tag_cloud), which has some helpful information and links to other resources.

[motorola4gatrix]

I suspect there is a plugin available for the blog you're using....assuming you've not written your own blog and are using something like Wordpress, Tumblr etc