The paper explicates the notions of topic, contrastive topic, and focus as used in the analysis of Hungarian. Based on distributional criteria, topic and focus are claimed to represent distinct structural positions in the left periphery of the Hungarian sentence, associated with logical rather than discourse functions. The topic is interpreted as the logical subject of predication. The focus is analyzed as a derived main predicate, specifying the referential content of the set denoted by the backgrounded post-focus section of the sentence. The exhaustivity associated with the focus and the existential presupposition associated with the background are shown to be properties following from their specificational predication relation.