This essay examines the intricate relationship between the Internet of Things (IoT) and cyber security, with a specific focus on the Australian context. It delves into how IoT technologies, while enhancing connectivity and efficiency, simultaneously introduce vulnerabilities that can be exploited by malicious actors. The essay explores the impact of IoT on critical infrastructure, detailing the potential for data breaches and cyber attacks. It discusses the Mirai DDoS attack as a prime example of the threats posed by compromised IoT devices. Furthermore, it compares IoT with the traditional internet and examines the factors contributing to cyber security issues, such as configuration problems and the use of less secure wireless networks. The essay also highlights the challenges in securing IoT networks and the privacy concerns associated with these technologies, emphasizing the need for improved security measures to protect both businesses and consumers from cyber threats. The conclusion reinforces the increasing cyber security risks and the importance of addressing them effectively.