The internet of things is the internetworking of physical devices, vehicles, buildings, and other items with network connectivity that enable these objects to collect and exchange data. It creates opportunities for more direct integration of the physical world into computer-based systems, resulting in improved efficiency, accuracy, and economic benefit. It finds numerous applications in the areas of smart grids, smart homes, intelligent transportation, and smart cities. This research presents a discussion on the internet of things and its applications in smart cities. The emerging technology of IoT makes smart cities efficient and responsive.