Hosting a roast is an activity where one person, usually a celebrity, is the subject of humorous remarks and jokes made by other people. The person who leads the roast is known as the emcee, or host. An emcee is responsible for introducing the roastee and the other roasters, setting the tone of the event, and keeping the roast running smoothly. Hosting a roast is a popular form of entertainment, and it requires a great deal of skill and wit to be successful.