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, 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