A predicate in a sentence is the part that describes what the subject is doing or the state of the subject. It always contains a verb and can also include objects, modifiers, adverbs, prepositional phrases, or objects. In other words, the predicate explains the action performed or state experienced by the subject. For example, in the sentence "The cat is sleeping in the sun," the clause "is sleeping in the sun" is the predicate, as it dictates what the cat is doing.