One may have read about the 3 kayas or bodies of a Buddha and still come off not even an iota nearer to the understanding. Nothing can beat hearing it from a great teacher like His Holiness who offered a very clear differentiation of the 3 kayas.
Part 1: Nature of Mind, Dharmakayahttp://www.sakyadrotonling.org/media/3kayas.part1.mp3
Part 2: Qualities of Sambhogakayahttp://www.sakyadrotonling.org/media/3kayas.part2.mp3
Part 3: Body of Emanations, Nirmanakaya 1http://www.sakyadrotonling.org/media/3kayas.part3.mp3
Part 4: Body of Emanations, Nirmanakaya 2http://www.sakyadrotonling.org/media/3kayas.part4.mp3
Part 5: Guru Padmasambhavahttp://www.sakyadrotonling.org/media/3kayas.part5.mp3
Part 6: Conclusion - Sole purpose of Bodhisattva Pathhttp://www.sakyadrotonling.org/media/3kayas.part6.mp3