Why is horace considered as a satirist??? What characteristics does he had for him to call as a satirist??? What does a satirist do???

Here's a good article on "satire" --

http://en.wikipedia.org/wiki/Satire

A satirist is a person who writes poems or stories or articles or draws pictures in which the current society or political scene is held up for scrutiny -- and the satirist does this to make us first laugh, and then think or say, "Hmmm! That's so true."

http://en.wikipedia.org/wiki/Horace
Here is an article on Horace (Horatius) including a section on his satires. Be sure to check out the external links at the bottom of this webpage, too.

=)