Wireless Sensor Networks (WSNs) are spatially scattered independent sensors to track physical objects or monitor environmental data and collectively transmit the data to master station. WSN is deployed in numerous fields such as animal tracking, precision agriculture, environmental monitoring, security and surveillance, smart buildings, health care and so on. This paper presents various applications of WSN with the intention of disseminating various applications of WSN for the better understanding of the research community to apply WSN in further innovative fields.