The Long March 4 is a series of Chinese rocket launch vehicles designed to carry satellites into orbit. Developed by the China Academy of Launch Vehicle Technology, it is primarily used for Earth observation and scientific missions. The first launch occurred in 1999, and the rocket has since undergone several upgrades to improve its payload capacity and reliability. The Long March 4 family includes different variants, such as the Long March 4A and Long March 4B. These rockets are known for their ability to deploy multiple satellites in a single mission, making them essential for China's growing space program and its ambitions in satellite technology and remote sensing.