What aspect of a professional email address typically includes?

A professional email address is typically constructed using the individual's first name and last name. This format not only establishes a clear connection to the person but also conveys professionalism and accountability. Using the individual's full name helps recipients quickly identify the sender, fostering trust and clarity in communication. A well-structured email address typically avoids any informal or casual elements, emphasizing a sense of professionalism that is crucial in business settings.

This contrasts with the other options: random characters would likely lead to confusion and lack of professionalism, a generic username could come across as unprofessional and unidentifiable, and nicknames may not instill the same level of seriousness expected in a professional context. Thus, utilizing the individual's first and last name is the best practice for creating a professional email address.