Autobiographical memory is memory of one's life. It is central to the establishment and maintenance of the self concept and one's personal and social identity, i.e. the sense of who you are. Autobiographical memory is considered to comprise of two types of memories: memories about specific experiences at specific times, and knowledge of facts relevant to the self, e.g. one's date of birth, information about family relationships, schooling, historical events that have occurred in one's lifetime.