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A Personal Data Assistant (PDA) refers to a small networked computer that provides various functionalities to manage personal information. These devices were popular in the late 1990s and early 2000s, designed primarily to assist users with tasks such as scheduling, note-taking, email communication, and managing contacts. They often included features like touch screens, stylus inputs, and basic organizational tools, effectively replacing traditional paper planners and agendas.

The reasoning behind this choice lies in the historical context and technical design of PDAs, which indeed were portable computing devices, compact enough to be handheld. They typically supported networks and could synchronize data with personal computers, allowing users to manage a significant amount of personal data on-the-go.

The other options do not accurately define PDAs. A mobile application for communication encompasses software applications rather than the hardware aspect focused on by PDAs. Wearable health devices are specialized gadgets aimed at health monitoring and are distinct from the broader functions of PDAs. Cloud-based storage solutions are services for storing and accessing data remotely, which is different from the personal management capabilities inherent to PDAs.