Regeneration refers to the process of regrowth, renewal or restoration of something that has been damaged or lost. In the context of biology, it refers to the process by which living organisms replace or restore damaged or lost tissues, organs or limbs. In ecology, it refers to the natural restoration of ecosystems that have been disturbed or damaged by human activities. Regeneration can also refer to personal growth and renewal, particularly in the context of mental, emotional or spiritual healing, where an individual seeks to restore or renew their sense of self, purpose or direction in life.