An object complement is a word or phrase that follows and modifies or renames a direct object in a sentence. It provides additional information about the object, helping to clarify or complete its meaning. For example, in the sentence "They elected John president," the word "president" is the object complement that describes what John has become. Object complements can be nouns, pronouns, or adjectives. They are often used with verbs that imply a change of state or identity, such as "make," "consider," or "name." In the sentence "She considers the project a success," "a success" serves as the object complement, giving more detail about the project.