E-mail is a method of exchanging digital messages over the internet. It allows users to send and receive text, images, and files quickly and efficiently. Each user has a unique email address that identifies their account, making it easy to communicate with others around the world. To send an e-mail, a user composes a message in an email client or web-based service, enters the recipient's email address, and clicks "send." The message travels through servers and networks until it reaches the recipient's inbox, where they can read and respond to it at their convenience.