Internet of things (IoT) is a complex ecosystem of connected devices that exchange data over a network and whose final aim is to provide services. The total number of installed connected devices is expected to grow exponentially in the near future. Analogously, the number of IoT-related studies published every year is constantly increasing. This huge knowledge asset has generated a fragmented picture about IoT systems, their basic constituents, their qualities, and in some cases even inconsistent terminologies and definitions.
This paper aims at providing a holistic view of the topics characterizing the IoT ecosystem by taking into account a technology perspective and a business one; then a definition of IoT ecosystem is given.