Can I do this with WordPress?

I notice that some bloggers use an interesting feature, in which a link is given that takes you to a log of all the web search terms used by people doing Google, etc. that (I think) matches your blog entry keywords.
This list logs those web search terms & presents them in various font colors and sizes in a random pattern, making for a really interesting effect.
I know there must be a certain name for this type of blog feature and I cannot remember it for the life of me, so I apologize for being unintentionally vague here. Any ideas on what this is called? Can you point me towards a plugin, etc. to add this feature to my WP blog? Thanks.