The Gaia mission is a major European Space Agency (ESA) project aimed at mapping the Milky Way with unprecedented precision. It will measure the positions, distances, space motions, brightnesses, and astrophysical parameters of stars, providing fundamental data for modern astronomy. The mission will observe all objects brighter than magnitude V ~ 20, resulting in over 1 billion observations. Gaia will perform astrometric, photometric, and spectroscopic measurements, enabling an unprecedented description of the Galaxy and its components. The spacecraft, launched in 2013, will scan the sky in precessing great circles, allowing systematic detection and classification of variable objects. The mission is expected to last five years, with a possible one-year extension, and final results will be released in 2021-2022. Gaia's instruments include the astrometric field (AF), spectro-photometry (BP and RP), and the Radial Velocity Spectrometer (RVS). The AF records white light in the G-band, while BP and RP cover specific wavelength ranges. The RVS provides radial velocity data for stars brighter than V ~ 16 mag. Gaia has two telescopes with a field of view of 0.45 deg² each, separated by 106.5 deg and rotating at 60 arc sec/sec. The mission's data processing involves multiple Coordination Units (CUs), including CU7 for variable star processing and CU4 for non-single star processing. The data will be released in five phases, with the first release in 2017. The mission's data will be used to study binary stars, with significant contributions from astrometry, photometry, and RVS. The mission is expected to detect millions of binary stars, including eclipsing binaries, which require complex processing. The Gaia mission will provide statistical descriptions of binary populations and help identify rare and unusual binaries. The mission's data will also be used to study stellar evolution, extreme masses, and orbital properties. The mission's data will be made public, with no proprietary period for scientific analysis. The mission will also issue alerts for transients and other important astronomical events.The Gaia mission is a major European Space Agency (ESA) project aimed at mapping the Milky Way with unprecedented precision. It will measure the positions, distances, space motions, brightnesses, and astrophysical parameters of stars, providing fundamental data for modern astronomy. The mission will observe all objects brighter than magnitude V ~ 20, resulting in over 1 billion observations. Gaia will perform astrometric, photometric, and spectroscopic measurements, enabling an unprecedented description of the Galaxy and its components. The spacecraft, launched in 2013, will scan the sky in precessing great circles, allowing systematic detection and classification of variable objects. The mission is expected to last five years, with a possible one-year extension, and final results will be released in 2021-2022. Gaia's instruments include the astrometric field (AF), spectro-photometry (BP and RP), and the Radial Velocity Spectrometer (RVS). The AF records white light in the G-band, while BP and RP cover specific wavelength ranges. The RVS provides radial velocity data for stars brighter than V ~ 16 mag. Gaia has two telescopes with a field of view of 0.45 deg² each, separated by 106.5 deg and rotating at 60 arc sec/sec. The mission's data processing involves multiple Coordination Units (CUs), including CU7 for variable star processing and CU4 for non-single star processing. The data will be released in five phases, with the first release in 2017. The mission's data will be used to study binary stars, with significant contributions from astrometry, photometry, and RVS. The mission is expected to detect millions of binary stars, including eclipsing binaries, which require complex processing. The Gaia mission will provide statistical descriptions of binary populations and help identify rare and unusual binaries. The mission's data will also be used to study stellar evolution, extreme masses, and orbital properties. The mission's data will be made public, with no proprietary period for scientific analysis. The mission will also issue alerts for transients and other important astronomical events.