What is the purpose of lower thirds in video presentations?

Lower thirds serve a vital role in video presentations by prominently displaying the names of speakers, their titles, and relevant session details. This graphical overlay appears in the lower third portion of the screen, making it easy for viewers to identify who is speaking and what they represent. This not only helps establish credibility and context for the audience but also ensures better engagement by providing clear information without distracting from the visual content of the presentation.

In this context, while advertisements could be shown on-screen, that is not the primary function of lower thirds, nor do they have any relation to audio enhancements or video quality improvements, which are addressed by other elements in video production. Lower thirds focus specifically on key informational aspects related to the video's content and participants.