Which speech type aims to increase knowledge on a specific subject?

The speech type that aims to increase knowledge on a specific subject is the informative speech. This type of speech is designed to educate the audience about a particular topic or concept, providing them with facts, data, and insights that enhance their understanding. The goal is to present information in a clear and engaging manner, often utilizing visual aids or examples to help illustrate the points made.

In contrast, a persuasive speech seeks to convince the audience to adopt a particular viewpoint or take a specific action, focusing more on argumentation and persuasion rather than education. A commemorative speech, typically used for honoring or celebrating a person, event, or achievement, also does not primarily aim to inform but rather to inspire and evoke emotions. An introduction speech is meant to introduce a speaker or a topic without delving deeply into the subject matter itself, serving more as a prelude than an informative presentation.