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The concept of Internet of Things (IoT) has been proposed for decades. It is designed to connect small physical devices and RFID tags together over the networks, particularly over the Internet. The networked things can be physical things without computation capabilities, or devices that have computation and communication capabilities. Things without computation capabilities need to attach RFID tags so that they have digital identities and can be networked. In an IoT system, application data are collected by sensors, transmitted over public and private networks, and processed in a data processing center, which may be used by end users. Command data from end users are transmitted down to the endpoint devices, including RFID tags. The process of data collection makes an effective connection between the physical world and digital data, while the process of endpoint device control is also a connection between the digital data and the physical world, so the techniques of IoT are beyond the edge of the the Internet is only about digital data, and the IoT can connect the physical world with the digital data. If the Internet together with data and related network services is treated as a cyberspace, then the techniques of IoT provide a connection between the physical world and cyberspace. This small but substantial characteristic makes IoT substantially different from the Internet in the traditional sense.