A confirmation email is an email sent to a user after they have completed an online transaction or signed up for a service. The purpose of this email is to provide evidence that the action was taken and to serve as verification that the user's account has been created, payment has been made, or subscription has been activated. It usually contains details such as the date and time of the transaction, the type of action taken, and any relevant information about the service or product purchased. The confirmation email acts as a record for both the user and the company, providing proof of the agreement between them.