What is the purpose of a multimedia presentation

The purpose is to show your idea in different ways to stand out. Instea of just a boring ol' word document. Bring color into it! or make a video!

might need to ask questions people no or have read somthing about.

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.