Mailgun is an email delivery service designed for developers and businesses. It allows users to send, receive, and track emails through a simple API. This service is particularly useful for applications that require automated email notifications, such as account confirmations or password resets. In addition to sending emails, Mailgun offers features like email validation and analytics. These tools help ensure that emails reach their intended recipients and provide insights into email performance. Overall, Mailgun streamlines the process of managing email communications for various online services.