The Gaia mission is a space observatory launched by the European Space Agency (ESA) in December 2013. Its primary goal is to create a detailed three-dimensional map of our Milky Way galaxy by measuring the positions, distances, and motions of over a billion stars. This extensive data will help scientists understand the structure, formation, and evolution of the galaxy. Gaia uses advanced technology, including a highly sensitive telescope and two optical instruments, to gather precise measurements. The mission is expected to last until at least 2025, providing valuable insights into stellar populations, the dynamics of the galaxy, and the presence of exoplanets.