Final Answer:
Webcasts is the distribution of digital media for on-demand playback on digital media players.
Its definition and specific association with the distribution of digital media for on-demand playback on digital media players. Therefore, the correct answer is option c. Webcasts.
Step-by-step explanation:
Webcasts refer to the distribution of digital media content for on-demand playback on digital media players. Unlike other options such as online chats, microblogging, discussion forums, or instant messaging, webcasts specifically focus on delivering media content in a format suitable for playback on digital media players.
Webcasts involve the streaming or broadcasting of audio or video content over the internet, allowing users to access the material at their convenience. This method is widely used for delivering presentations, lectures, or entertainment content that users can stream on their digital media players, ensuring on-demand access to the desired information or entertainment.
The options provided encompass various forms of online communication and interaction, but webcasts uniquely address the distribution of digital media content tailored for playback on digital media players. This distinction makes option c the most fitting choice for the given question, emphasizing the specific context of on-demand playback for digital media consumers.