Important uses for a wireless sensor network (WSN) include target tracking and remote environmental monitoring. This has been made possible by the accessibility of sensors that are more compact, affordable, and sophisticated, especially in recent years. These sensors have wireless interfaces built into them so they can communicate to one another to establish a network. The application has a considerable impact on the WSN's design and must take into account elements including the environment, the application's design goals, cost, and hardware and organizational restrictions. This survey's objective is to provide a review on applications and implementation challenges of WSNs. The WSNs are essential to a wide range of real-time applications worldwide. Due to the increased demand for WSNs in numerous applications around the world, there has been a lot of research done in this area during the past ten years. The study of WSNs is a new area of study for researchers looking for answers to problems with energy consumption, sensor placement, routing algorithms, resilience, efficiency, and other concerns. Over the past ten years, numerous researchers have run across several problems linked to computational complexity and network architecture. As a result of their applicability in a variety of fields, including healthcare, surveillance, and environmental monitoring, WSNs are growing in popularity worldwide.