Death is the end of all biological functions that maintain a particular living organism. Phenomena which usually bring about death take in biological aging (senescence), predation, malnutrition, disease, suicide, murder and accidents or trauma resulting in terminal injury.
Bodies of living creatures begin to decay soon after death. There is no technical proof as to whether or not consciousness survives the demise of an organism.
In human cultures, the nature of death and humanity's consciousness of its own mortality has for millennia been a concern of the world's religious traditions and of philosophical inquiry. This comprises belief in resurrection (associated with Abrahamic religions), reincarnation or rebirth (associated with Dharmic religions), or that consciousness eternally ceases to exist, known as oblivion.