Moisture content refers to the amount of water present in a substance or material. It is an important measure for many applications, including agriculture, construction, and manufacturing. In general terms, moisture content indicates how much of a given sample is made up of water. The percentage of moisture can vary greatly depending on the substance being measured - for example, soil may have a higher moisture content than wood or cement. Measuring moisture content is important in determining the quality and usability of many materials, as well as monitoring environmental conditions that affect their stability and safety.