This is a long and complete story about the author's full life. This type of writing covers everything from birth to the present. Often, the purpose of writing an autobiography is: to share a person's life path with a broad audience, to leave your mark, to reconcile the past, or to make your memories last.
Memoirs are similar to autobiographies with a single difference – they don't have to cover a person's entire life. Instead, you can narrow your focus to a memoir's most exciting and important past events including as many details as you can.
Personal essay
This is the last and shortest type of autobiographical writing. Simply put, it is just an essay about yourself. Unlike other essay types, this one is more intimate and emotional; it requires you to share personal experiences. As a rule, such a paper focuses on one specific event, a period of time, a person, etc.