The current technology has made the paradigm shift from the wired to wireless by leaving the great impact on the industry and communications, application fields. Sensors, dusts, internet of things are the key area of research in now-a-day. This paper is going to discuss the technical details of the various components of the WSN with the options in the market, current trends, and key application areas. Never the less, this paper will highlight the diverse architecture, topology, protocol options with the valid classification and purpose.