What is the primary purpose of an impromptu speech?

The primary purpose of an impromptu speech is to convey a clear message on a given topic without prior preparation. In an impromptu speaking scenario, the speaker is typically presented with a topic and must organize their thoughts quickly, forming a coherent speech on the spot. This type of speech emphasizes the speaker's ability to think on their feet and communicate effectively, showcasing their spontaneity and quick reasoning skills. The focus is on delivering a message that is understandable and engaging, rather than relying on extensive background research or complex vocabulary.

Other options like entertaining the audience without a specific topic or providing detailed information on a researched topic do not align with the nature of an impromptu speech, which requires addressing a specific topic directly and succinctly. Similarly, while impressing judges may be a secondary benefit, it is not the fundamental goal of an impromptu speech, which centers on clarity and direct communication.