When is consent a defense to defamation?

In assessing a defamation claim, what is actual malice? In assessing a defamation claim, what must a plaintiff prove when a statement is a matter of public concern? In assessing a defamation claim, what must a plaintiff prove when the issue is a matter of private concern? In assessing a defamation claim, what must a plaintiff prove when they are a private person and the statement is a matter of public concern? In assessing a defamation claim, what must a plaintiff prove when they are a public official or figure? What is defamation? What is libel? What is libel per quod? What is slander? What is slander per se? What may be used as defenses to a defamation claim? When is absolute privilege a defense to defamation? When is qualified privilege a defense to defamation? When is truth a defense to defamation?