A formal speech is a preplanned speech that is given to an audience at a formal or professional event, business lectures and celebrations like weddings being the most common. Formal speeches differ from impromptu speeches, which are spontaneous speeches that are not written or rehearsed beforehand.
There is always an objective for a formal speech. In order to convey a convincing or moving argument, the speech must be concise and tightly focused around the topic of concern. On top of content, a smooth and confident delivery is necessary to maximize the impact that the words have. Public speakers should spend time beforehand editing and rehearsing their speech.