An email address is a unique identifier used to send and receive electronic messages over the internet. It typically consists of two main parts: a username and a domain name, separated by the "@" symbol. For example, in the email address "example@gmail.com," "example" is the username, and "gmail.com" is the domain. Email addresses are essential for communication in both personal and professional settings. They allow users to connect with others, share information, and access various online services. Most email providers, such as Gmail, Yahoo, and Outlook, offer free accounts to users.