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.

References

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  1. McArthur, Tom (ed) 1992. The Oxford companion to the English language. Oxford University Press.
  2. 2.0 2.1 Robin L. Simmons. "The Transitive Verb". Grammar Bytes!. Retrieved 13 September 2015.