Ditransitive verbs are a type of transitive verb. If you're a geometry nut, a transitive verb is a rectangle and a ditransitive verb is a square in that a square is a rectangle but a rectangle isn't a square. Okay, you get it. We probably didn't need to tell you that. We just like math analogies.
Really, the only difference between transitive and ditransitive verbs is that ditransitive verbs take two objects instead of one. There are only a few true ditransitive verbs, probably because life isn't usually so complicated. How many actions inherently require more than two participants (subject and direct object)?
Yeah, not many.