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A conference is an event where people get together to discuss things. For example, scientists usually present their findings at conferences. Many other types of people other than scientists attend conferences also. Business people sometimes come together to talk about things. Using modern media, like the Internet, or the telephone people can talk to each other that are not in the same place. This is then called a conference call. Very often, digital video cameras can be used to transmit images, as well as sound.