Explain what an email ID is and describe its structure.

An Email ID, also known as an email address, is a unique identifier for an email account. It is used to send and receive electronic messages over the Internet.

An Email ID typically consists of two main parts separated by an "@" symbol:

• The username: This is a unique name chosen by the user.
• The domain name: This identifies the email service provider (e.g., gmail.com, outlook.com) or an organization.

For example, in the email ID john.doe@example.com, john.doe is the username and example.com is the domain name.