The second truth is that the origin of dukkha can be known. Within the context of the four noble truths, the origin of dukkha is commonly explained as craving (Pali: tanha) conditioned by ignorance (Pali: avijja). On a deeper level, the root cause of dukkha is identified as ignorance (Pali: avijja) of the true nature of things. The third noble truth is that the complete cessation of dukkha is possible, and the fourth noble truth identifies a path to this cessation.[note 7]

What does the second of the Four Noble Truths explain?