What is emotivism ethics?

A fundamental question about all ethical theories is: what is a value? Emotovist theories all answer that question the same way: a value is an expression of emotion. So an ethical judgment, according to this theory, is radically different from an ordinary judgment. For example, an ethical judgment that something is morally good or morally wrong is not a natural or intuitional judgment that involves ascribing a property to something; instead, it is more like an interjection, optative, or performative.