The four basic types of speeches are: to inform, to instruct, to entertain, and to persuade. These are not mutually exclusive of one another. You may have several purposes in mind when giving your presentation. For example, you may try to inform in an entertaining style.
Speeches can be grouped loosely into 3 basic groups:
Persuasive - try to convince your listener of something More about Persuasive Speeches Also use Monroe's Motivated Sequence to help convince your audience in 5 steps.
Informative - to tell/educate your listeners about something More about Informative Speeches
Special Occasion - to talk about someone or an event More about Special Occasion Speeches