To effortlessly gather knowledge and data from wireless devices, Wireless Sensor Networks (WSNs) are now used as one of the successful distributed applications. The unique architecture of WSNs made it possible to employ them in a wide range of contemporary industrial applications, including automated control systems and systems for surveillance and monitoring that can help bridge the gap between user needs and available technology. The control of topology, QoS, robustness, placement, power consumption, scalability, reliability, resource utilization, data availability, and security are additional problems faced by WSNs. WSNs are planned to be merged into the internet of things (IoT) in the future when sensor nodes automatically join the internet and use it to cooperate and complete their functions. This survey paper proposes a taxonomy for wireless sensor networks (WSN), highlights some of the essential technologies, and profiles some applications that have the potential to make a striking difference in human life, especially for the differently abled and the elderly. Compared to similar survey papers in the area, this paper is far more comprehensive in its range and exhaustively covers the most significant technologies, from sensors to applications. Highlights some of the most powerful technology and describes several applications that have the potential to significantly improve human life, particularly for the elderly and those with disabilities. Compared to a different area, this one is much more thorough and covers all essential critical technologies, from sensors to applications. This paper aims to provide a better understanding of such limitations.