Informative speeches are intended to provide the audience with useful information. An informative speech is successful when after hearing the speech, the audience gained new and relevant information. Oftentimes during the speech, the speaker will present supportive aids such as statistics, slides or handouts to reinforce important points made throughout the speech. It's essential to be specific and provide accurate information for successful presentation of informative speeches. According to the Public Speaking Training Institute, informative speeches follow the format of opening, purpose, supportive points and conclusion.
Typically recognized as the speech type with the least structure, effective persuasive speeches will succeed at convincing the audience to agree with the presenter's argument or will insight a change in previous perspectives. Also referred to as motivational speeches, persuasive speeches can be effective when presented in the form of a story. In addition, persuasive speeches generally conclude with a call to action for the audience to consider. Political, religious and sales speeches are the most common persuasive speeches.
Ceremonial speeches are types of speeches such as wedding toasts, speeches given at graduations or eulogies at a funeral. Ceremonial speeches are successful when the speech is specific to the occasion or audience. According to an article on the Westside Toastmasters website, writing good ceremonial speeches can be tough, partly because the goals are uncertain.
Extemporaneous or impromptu speeches by definition are given with little to no strategy or forethought. Typically the only preparation for delivering extemporaneous speeches is to adhere to the basic structure of effectively and concisely presenting information. Having to give an impromptu thank-you speech is an example of an extemporaneous speech.