Transitivity in grammar is about whether a verb has an object or not. A transitive verb has an object; an intransitive verb does not.[1]p1051 Examples:
A transitive verb is an action verb. It expresses something doable (something possible to do).[2] The direct object is something or someone who is the receiver of the action (verb).[2] In the first two examples above, the 'trip' and the 'book' are the direct objects. 'Enjoyed' and 'read' are the transitive verbs.