涅槃 (Liberation) is a key concept in Buddhism that signifies the ultimate state of freedom from suffering and the cycle of birth and rebirth, known as samsara. It represents the end of desire, attachment, and ignorance, leading to profound peace and enlightenment. Achieving 涅槃 involves deep meditation, ethical living, and the understanding of the Four Noble Truths. It is not a physical place but a state of being where one transcends worldly concerns and experiences true liberation from all forms of suffering.