What is the format of an email?
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.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is the format of an email?
### Input: 
### Response: 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.