What is the smallest "full feature" PC today?

The correct answer is a smartphone/PDA because these devices pack a wide range of features into a compact form factor. Modern smartphones and PDAs (Personal Digital Assistants) are capable of performing many functions typically associated with full-featured PCs, such as web browsing, email communication, multimedia playback, and even productivity applications. They often come equipped with powerful processors, substantial RAM, and large storage capacities, allowing them to handle a variety of tasks that traditionally required a desktop or laptop computer.

While desktops and laptops are also full-featured PCs, they are larger, making the smartphone/PDA the most compact option. Tablets, while portable and capable of many functions, typically do not integrate the same level of computing power and productivity features as smartphones, particularly when it comes to connectivity and a wide range of applications.