What is the difference between Dharmakaya and Sambhogakaya?

Within the Trikāya doctrine (the bodies of the Buddha) I've never felt very clear about the differences between the Dharmakaya and Sambhogakaya. I believe that the Nirmanakaya is the physicality of the Buddha (happy to be corrected on this) but I'm vague about what Dharmakaya and Sambhogakaya are and how they relate to each other. I'd appreciate if anyone can summarise the differences and the relations between them. I'm interested in answers from all traditions - I'm unsure if there are variations in interpretations of the doctrines across Buddhist schools and traditions to be honest.