I define a presentation as a means of communication that can be adapted to various speaking situations, such as talking to a group, addressing a meeting or briefing a team. Effective presentations usually require careful thought and preparation—although this preparation need not take very long. You also need to decide on your presentation method. Presentations range from the formal to the informal. Your choice of presentation method will depend on many factors, including the audience, the venue, the facilities, and your own preferences.