What defines vocal fillers in terms of presentation quality?

Vocal fillers are defined as irrelevant distractions in speech that can detract from the overall presentation quality. These include words or sounds that speakers use to fill pauses, such as "um," "uh," "like," and "you know." While speakers may use these fillers subconsciously, they can interrupt the flow of the presentation and make it harder for the audience to follow the speaker’s message. This distraction can lead to a lack of engagement and may signal to the audience that the speaker is unprepared or lacking confidence.

The other choices reflect qualities that contribute positively to presentation effectiveness. Clarity and engagement enhance the audience's understanding and interest, while enhancements to the message would involve adding valuable content or context, and a clear understanding of the content ensures the speaker can convey their message effectively. However, vocal fillers do not contribute positively; instead, they can hinder the speaker's credibility and make the speech less effective.