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Public speaking (also called oratory or oration) is the process or act of performing a speech to a live audience. This type of speech is deliberately structured with three general purposes: to inform, to persuade and to entertain. Public speaking is commonly understood as formal, face-to-face speaking of a single person to a group of listeners. It is closely related to "presenting", but presenting is more often associated with commercial activity.
There are five basic elements of public speaking that are described in Lasswell's model of communication: the communicator, message, medium, audience and effect. In short, the speaker should be answering the question "who says what in which channel to whom with what effect?"
Public speaking can serve the purpose of transmitting information, telling a story, motivating people to act or some combination of those. Public speaking can also take the form of a discourse community, in which the audience and speaker use discourse to achieve a common goal.
Public speaking for business and commercial events is often done by professionals. These speakers can be contracted independently, through representation by a speakers bureau, or by other means. Public speaking plays a large role in the professional world; in fact, it is believed that 70 percent of all jobs involve some form of public speaking.
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