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The term that refers to the network of physical devices connected to the internet is the Internet of Things (IoT). This concept encompasses a vast array of physical objects, including everyday household items, industrial equipment, and wearables, that are embedded with sensors, software, and other technologies that enable them to connect and exchange data over the internet.

The primary function of IoT is to enhance the connectivity and accessibility of these devices, allowing them to gather and share data seamlessly, improving efficiencies and contributing to intelligent systems. This connectivity can lead to improved monitoring, management, and responsiveness in various applications, from smart homes to industrial automation.

In contrast, cybersecurity primarily focuses on protecting systems, networks, and data from digital attacks. Cloud architecture refers to the structures and strategies used to deliver cloud-based services and storage solutions. Blockchain infrastructure pertains to the decentralized technology underlying cryptocurrencies and other secure digital transactions. Each of these areas plays a critical role in the tech ecosystem, but none specifically describes a network of connected physical devices like the Internet of Things does.