system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is the format of an email?


assistant
Emails contain a username, the @ symbol, and a website domain. The website domain must contain a "." (dot), where the left and right side of the dot are nonempty. For example, lorem.ipsum@dolor.com is an email.