Anicca is a Pali word that means “unstable,” “impermanent” and “inconstant.” It refers to the Buddhist concept of impermanence that all existence is temporary. Anicca is one of the three fundamental and essential doctrines in Buddhism. The other two are anatta (no permanent soul or self exists) and dukka (suffering). These doctrines are collectively referred to as “right understanding.”
Anicca is also known by the Sanskrit term anitya. In Hinduism and yogic traditions, the concept of anicca/anitya does not refer to all existence. Instead, it is believed that humans have both permanent and impermanent aspects.