What is a Comedian?
A comedian is someone who has the job of entertaining an audience and making them laugh. He or she typically develops an overall structure for their act and also creates an on-stage personality (a ventriloquist will use a puppet) that they keep consistent throughout the show.
Typically, the comedian writes and performs their own material, but the more established comedians may work with one, or a team, of writers.
Within the structure of the act, the comedian will tell jokes, amusing stories or do some slapstick. He or she will also make references to current events and news items, so it is important to keep up to date with such things.
A comedian needs to be able to interact with the audience and be able to deal with both positive and negative feedback. It is imperative that he or she captures the attention of the audience, and should be able to adapt and/or improvise in order to respond to the audience's reaction appropriately.