People's means of communication are referred to as speech and expression. Speech is the ability to convey ideas and thoughts by expressive vocal sounds, or the ability to express ideas and thoughts in this manner. A communication to an audience is referred to as a speech, address, oration, or harangue. Speech is a generic term that does not imply form, length, or whether it is planned or not. An address is a formal, prepared speech that is tailored to a specific topic or occasion. An oration is a polished, rhetorical speech delivered with eloquence and learned delivery techniques, typically on a significant occasion. A harangue is an aggressive, informal speech intended to elicit intense emotions from a casually gathered audience (sometimes to lead to mob action).