 The Sentinel-2 mission is a satellite program operated by ESA as part of the Copernicus Program of the European Commission. It is designed to acquire high-resolution optical images for use in environmental monitoring and land management applications. After one year in orbit, the mission has been validated with respect to its top of atmosphere and bottom of atmosphere products. Results indicate that the mission's performance meets expectations in terms of radiometric and geometric accuracy. Next steps include further refinement of the mission's data quality, as well as development of new algorithms to improve the mission's capabilities. This article was authored by Foran Gaskin, Catherine Buzanak, Olivier Fipot, and others.