If you have laughed at one point or the other, you have encountered comedy, you just didn't know.As it refers to any discourse or work generally intended to be humorous 
What kinds of comedy are there?
Well, I can't say categorically but Satire and political satire use comedy to portray persons or social institutions as ridiculous 
Interesting, who's a good comedian?
Someone that can make one laugh. The history can be traced as far back as to Ancient Greece
Do you know anything about comedy in ancient Greece?
Just the roots. In modern context,  comedy is used in theatres, television, film, stand-up comedy, or any other medium of entertainment to depict entertainment
What's a good television comedy show?
In  theatre Greek Show  dramatic performance which pits two groups or societies against each other in an amusing agon or conflict.