The term 'party leader' can refer to four different roles: a hostess, a HOST, a WHIP, and an EMCEE. A hostess is a woman who is responsible for welcoming guests and making sure they are comfortable. A HOST is a man who performs the same duties as a hostess. A WHIP is a person who ensures that members of a political party vote in accordance with the party's wishes. An EMCEE is a person who acts as a master of ceremonies at a public event.