A pillar of the Future Internet, the Internet of Things (IoT) will comprise many billions of Internet-connected objects (ICOs) or "things" that can sense, communicate, compute, and potentially actuate, as well as have intelligence, multimodal interfaces, physical/virtual identities, and attributes. The IoT incorporates concepts from pervasive, ubiquitous, and ambient computing, which have been evolving since the late '90s and have now reached some level of maturity. It fuses the digital and physical worlds by bringing different concepts and technical components together. Along with the World Wide Web and mobility, IoT potentially represents the most disruptive technological revolution to date. With billions of ICOs and a diverse abundance of sensors, the IoT will be an enabler of ubiquitous sensing.