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?
dramatic performance which pits two groups or societies against each other in an amusing agon or conflict. Northrop Frye depicted these two opposing sides as a "Society of Youth" and a "Society of the Old." A revised view characterizes the essential agon of comedy as a struggle between a relatively powerless youth and the societal conventions that pose obstacles to his hopes. In this struggle, the youth is understood to be constrained by his lack of social authority, and is left with little choice but to take recourse in ruses which
Comedy
In a modern sense, comedy (from the , "kōmōidía") refers to any discourse or work generally intended to be humorous or amusing by inducing laughter, especially in theatre, television, film, stand-up comedy, or any other medium of entertainment. The origins of the term are found in Ancient Greece. In the Athenian democracy, the public opinion of voters was influenced by the political satire performed by the comic poets at the theaters. The theatrical genre of Greek comedy can be described as a