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The growing era of technology through the internet, Internet of Things (i.e. IoT) has a powerful and strong industrial system that provides an opportunity to grow and applications to use ubiquitously. Its applications use sensor, wireless, mobile and RFID technology devices. In recent years IoT applications are enhancing to being deployed as well as developed. The IoT promises to have a great future era of the Internet uses that involves machine-to-machine communication. It helps to enable the sensor network as well as technologies, even IoT got involved in our day-to-day routine such that it supports to control and to monitor a human being's mundane by providing mobile access, remotely. Undoubtedly, remote access is the incredible feature of the IoT which has been given to this world. The main objective of IoT is to provide remotely accessible at low-cost that too by often visits through electronic devices. This paper presents the maximum possibilities of challenges, applications, security issues and techniques of IoT.