Sorting is the process of arranging items in a specific order.
In an email client, you can sort your emails based on various criteria like sender, subject, size, or date.
When you sort emails by date, the email client uses the timestamp associated with each email to arrange them.
This timestamp indicates the exact time the email was received (in the inbox) or sent (in the sent items folder).
The arrangement will be chronological, either from newest to oldest or oldest to newest.
Therefore, sorting by date arranges emails based on their received or sent time.