Soil moisture sensors are devices used to measure the amount of water present in the soil. They help farmers and gardeners determine when to water their plants, ensuring that crops receive the right amount of moisture for optimal growth. These sensors can be placed directly in the ground and provide real-time data on soil conditions. There are various types of soil moisture sensors, including tensiometers and capacitance sensors. Tensiometers measure the tension or suction of water in the soil, while capacitance sensors detect changes in electrical capacitance caused by moisture levels. Both types contribute to efficient water management in agriculture and landscaping.