Low earth orbits or LEO satellites are used for telecommunication that orbit till a distance of around 2,000 kilometers above the earth's surface. These satellites are also used for data communication for instance e-mail, video conferencing, etc. These satellites move at extremely high speeds and are not fixed in space in relation to the earth.

from Times of India https://timesofindia.indiatimes.com/business/india-business/mission-shakti-indias-first-anti-satellite-missile-system-that-destroyed-a-leo-satellite/articleshow/68594026.cms