What are the different categories of devices, and how do their functionalities differ?

Devices can be categorized into several types, including smartphones, tablets, wearables, and IoT devices. Smartphones are versatile and designed for communication and apps, while tablets offer a larger screen for media consumption and productivity. Wearables, such as smartwatches, focus on health tracking and notifications. IoT devices are specialized for connecting to networks and gathering data. Each category has unique functionalities tailored to different user needs.