root key

A keyA number used to encrypt (or encode) information so that no one can read it. Keys are used when encoding and decoding. You shouldn't have to mess with keys yourself. that is typically unique to each IoTThe Internet of Things. A broad term covering many different applications where "things"  are interconnected through the internet. device (but might not be) and which is used to create session keysA one-time-use security key used for encryption during a single communication session between an IoT device and an IoT server. for communication between IoT devices and IoT serversA computer with a dedicated purpose. Older familiar examples are print servers (a computer that controls local printing) and file servers (a computer used for storing files centrally). More modern examples are web servers (the computers that handle your web requests when you use your browser) or application servers (computers dedicated to handling the computing needs of a specific application). Servers are often powerful, expensive machines since they have to handle a heavy load. in the cloudA generic phrase referring to large numbers of computers located somewhere far away and accessed over the internet. For the IoT, computing may be local, done in the same system or building, or in the cloud, with data shipped up to the cloud and then the result shipped back down..