The glossary of telecommunications terminology continues with an issue dedicated to low Earth orbit (LEO) satellites

This issue provides a brief introduction to LEO technology.

Low Earth Orbit (LEO) operates in the closest orbit to Earth, enabling shorter data transmission times and providing low-latency, stable connectivity.

In recent years, LEO satellite technology for telecommunications has advanced rapidly, with active competition among companies in the United States, China, and Europe. At the same time, startup companies are placing increasing focus on research and development of advanced technologies.

While approximately 2,600–3,000 active satellites were operating in low Earth orbit in 2020, this number exceeded 10,000 by the first quarter of 2026, demonstrating the significant growth in LEO satellite deployment in recent years.