CTD sensors are instruments used to measure the conductivity, temperature, and depth of water. These sensors are essential for understanding oceanographic and environmental conditions, as they help scientists gather data about water quality and circulation patterns. The information collected can be used in various fields, including marine biology, climate research, and environmental monitoring. Typically deployed on research vessels or buoys, CTD sensors can be lowered into the water column to collect data at different depths. The conductivity measurement helps determine salinity, while temperature readings provide insights into thermal stratification. Depth is measured using pressure sensors, allowing for a comprehensive analysis of aquatic environments.