Courtesy Premiere Global Services
In the past few years, corporations have gotten bigger and more spread out. Many American employees -- more than 44 million in 2004 -- also do at least some of their work from home [ref]. Since offices and employees can be thousands of miles apart, getting everyone into the same room for meetings and training has become decidedly impractical for a lot of companies.

That's why teleconferencing -- the real-time exchange of information between people who are not in the same physical space -- has become such a big industry. The American audio conferencing industry alone reported $2.25 billion in revenue in 2004 [ref]. Through teleconferencing, companies can conduct meetings, customer briefs, training, demonstrations and workshops by phone or online instead of in person.

In this article, we'll look at different types of teleconferencing, from conference calls to online meetings.

The Popular Polycom
The Polycom SoundStation is one of the most popular teleconferencing units available. You might have seen it in movies or on TV. Check it out.