A salinity profile is a vertical measurement of the salt concentration in a body of water, such as an ocean or lake. It helps scientists understand how salinity varies with depth, which can affect marine life and water circulation. Salinity is usually measured in parts per thousand (ppt) and can change due to factors like evaporation, precipitation, and freshwater inflow. Researchers often use tools like CTD sensors (Conductivity, Temperature, Depth) to collect salinity data at different depths. Analyzing the salinity profile can provide insights into the marine ecosystem, climate change effects, and the overall health of aquatic environments.