Which data format is specifically designed for distributing audio or video files to users?

The correct choice is Podcast because it is specifically designed for distributing audio or video files to users. A podcast typically consists of a series of spoken-word content, music, or sound effects, delivered in episodes, which can be downloaded or streamed. This format is popular for its accessibility, allowing users to listen to or watch content at their convenience, often through subscription services that automatically deliver new episodes.

In contrast, while a stream can refer to the real-time delivery of audio or video content, it does not specifically denote a series or episodic distribution method characteristic of podcasts. A video blog is more focused on visual content and personal commentary rather than a structured series of audio episodes. A webinar refers to an online seminar or presentation, typically live and interactive, rather than a format designed for distributing pre-recorded media. Thus, podcasts are uniquely tailored for the on-demand distribution of audio and video files, making them the most fitting choice.