What is Earth observation satellites?

Earth observation satellites or Earth remote sensing satellites are satellites used or designed for Earth observation (EO) from orbit, including spy satellites and similar ones intended for non-military uses such as environmental monitoring, meteorology, cartography, and others. Earth Observation (EO) satellites help us to monitor and protect our environment, manage our resources, respond to global humanitarian disasters and enable sustainable development. They provide essential information on a vast number of areas, including; ocean salinity, ice thickness, crop health, and air quality.