The third Noble Truth is the truth of the cessation of dukkha. Cessation (Pali: nirodha) refers to the cessation of suffering and the causes of suffering. It is
the cessation of all the unsatisfactory experiences and their causes in such a way that they can no longer occur again. It's the removal, the final absence, the cessation of those things, their non-arising."
Cessation is the goal of one's spiritual practice in the Buddhist tradition. According to the Buddhist point of view, once we have developed a genuine understanding of the causes of suffering, such as craving (tanha) and ignorance (avijja), then we can completely eradicate these causes and thus be free from suffering.
Cessation is often equated with nirvana (Sanskrit; Pali nibbana), which can be described as the state of being in cessation or the event or process of the cessation. A temporary state of nirvana can be said to occur whenever the causes of suffering (e.g. craving) have ceased in our mind.
Joseph Goldstein explains:
Ajahn Buddhadasa, a well-known Thai master of the last century, said that when village people in India were cooking rice and waiting for it to cool, they might remark, "Wait a little for the rice to become nibbana". So here, nibbana means the cool state of mind, free from the fires of the defilements. As Ajahn Buddhadasa remarked, "The cooler the mind, the more Nibbana in that moment". We can notice for ourselves relative states of coolness in our own minds as we go through the day.