A Direct Object is the noun or phrase that receives the action that is performed by the subject. It answers the “who” or “what” after an action verb.
For example: Bob crashed the car. What did Bob crash? The car. So, “the car” is the direct object in the original sentence.
You can also have mulitple direct objects in a sentence, for instance: Bob hit the motorcycle and the truck. What did Bob hit? The motorcycle and the truck. So, “the motorcycle” and “the truck” are the direct objects.