Yajur Veda you could view as these prose mantras, knowledge of these prose mantras is Yajur Veda. Sama Veda, this is knowledge of songs or hymns. Atharva Veda, you can view these as knowledge of things that you should do in your life. Now these four texts can be subclassified into the type of text that they actually are. So what you see here is the subclassification of the Vedas that's often referenced, that amongst these texts, some of the verses are mantras, hymns, prayers, those are referred to as Samhitas. You have the things that are more ritual ceremonies, these are Aryanakas. And Aryanakas are also things being referred to things that you have learned or rituals to do in the forest.