What is a USB flash drive?

A USB flash drive is indeed a portable storage device that allows users to store and transfer digital data easily. It connects to computers and other devices via a Universal Serial Bus (USB) interface, which is a commonly used standard for many electronic devices.

The key features of a USB flash drive include its small size, lightweight design, and the ability to store a significant amount of data—from a few megabytes to several terabytes, depending on the model. This makes it especially convenient for users who need to carry files such as documents, photos, videos, and presentations on-the-go.

In comparison to the other options, an external hard drive is typically larger in size and capacity and is often used for more extensive data storage needs, while a networking device facilitates communication between computers and networks rather than storing data. A power supply unit is responsible for providing power to a device and does not involve data storage at all. These distinctions clarify why the correct choice is about portable storage.