Basic information about the characteristics, uses, and implications of communication satellites is presented. Characteristics covered include the various types of systems--such as point-to-point, distribution, and broadcasting satellites--and the flexibility, capacity, geographical coverage, cost and disadvantages of satellites. The section on uses discusses existing and planned satellite communication systems, patterns and purposes of use, categories of services and users, remarks on costs, and alternatives. Implications for information, education, culture, the law, and institutional frameworks are noted. A selected bibliography is included. (JK)