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Transitive verbs are those that can refer to the accusative object (Akkusativobjekt) and answer the question Wen/Was? (whom/what?). They can be used to build a sentence with the passive voice. On the other hand, intransitive verbs are those that cannot refer to an object in the the accusative case Akkusativ and cannot form the passive voice.
Some verbs depending on the meaning might be transitive or intransitive. Most often when a verb takes an object, it is transitive. If there is no object, then the verb is usually intransitive.