An apology letter is written to express regret for past doings. It is of two types business apology letter and formal apology letter. An apology letter is a written statement of acceptance of fault or mistake and to apologize to someone for the mistakes, wrongdoing, misunderstanding, and misbehavior done in the past.

An apology letter is written to express regret for past doings. It is of two types business apology letter and formal apology letter. An apology letter is a written statement of acceptance of fault or mistake and to apologize to someone for the mistakes, wrongdoing, misunderstanding, and misbehavior done in the past.