Extempore speaking refers to unscripted speeches where the speaker chooses their words spontaneously at the time of speaking. It requires mental preparation in advance through knowledge acquisition and consideration of the audience. Effective extempore speaking flows smoothly while addressing the purpose and impact on listeners, though complete improvisation without any preparation is unrealistic. Tips for extempore speaking include starting at an even pace, maintaining confidence, handling mental blocks gracefully, controlling the speech, and presenting multiple perspectives on controversial topics when possible.