A keyword outline is a device used by public speakers to condense major points. This is basically a map of the subject matter, using keywords to identify salient points and to ensure correct flow of the speech. This is called 'extemporaneous speaking', which isn't a memorized or rote speech, but a more flexible dynamic, used to improve fluency. The keyword outline also provides continuity of subject matter flow, and reduces the dependency on formal speeches, which can be inflexible and verbose. In most cases it's advisable to add a little to the subject keywords as prompts for content and to ensure coverage of subjects.
Examples of Keyword Outline: