An email alias is an email address that shares a mailbox with a different e-mail. For instance, you could have firstname.lastname@example.org as well as email@example.com and messages sent to both of them will be received in just one mailbox. This feature will make it less complicated and more convenient to handle many different email addresses as you will have to log in to one mailbox if you work with webmail as well as create a single e-mail address in a email client on your computer. If you create an alias, you will not only be able to get emails, but you'll also be able to send messages from the various addresses and they'll share the Outbox, so you will still have all communication in a single place. Working with aliases is a replacement for using various e-mail addresses for various purposes or forwarding a single e mail address to a new one so that you can manage the emails of both in a single location.