Beidou is a Chinese satellite navigation system that provides accurate positioning and timing services globally. It is designed to be an alternative to other systems like GPS and GLONASS. The system consists of a constellation of satellites that work together to determine locations on Earth. The Beidou system has been developed in several phases, with the first phase launched in 2000. By 2020, the full constellation was completed, allowing for improved navigation services in various sectors, including transportation, agriculture, and disaster relief.