If you cannot communicate effectively with prospects, employers, or colleagues, jobs are lost, contacts are wasted, and leads are burned. The classic image of public speaking is that of someone standing behind a lectern addressing a large group of people. Unless you give seminars for a living, you probably won't find yourself in this position. You are much more likely to do your public speaking in more intimate settings, either from across a desk or in a small meeting. Still, you need to prepare for these performances just as if you were about to give a speech to thousands of eager listeners.
Decision makers value their time.
You should value their time, too. Be ready to expand on a specific point or to answer any questions that may arise, but don't go over every detail unless you have a good reason to do so. Specifics clarify and prove your point. Preparation researching the audience, their needs, and possible solutions helps give you confidence in yourself. That, in turn, helps the prospective client become confident in you.