Why do websites use “email” and “username” interchangeably as log-in credentials?

Question

Why do websites use “email” and “username” interchangeably as log-in credentials?

In: 58

Answer 1

One reason they’ll list both is because they still support both…for now. Websites that have transitioned to email addresses for new accounts often still need to allow people to login “the old way” because that’s how those accounts are set up and forcing everyone to login and change it is a difficult proposition.