POP3
POP3 operates by downloading emails from the server to the user’s device, where they are stored locally. Once downloaded, emails are typically removed from the server, though some configurations allow emails to remain on the server for a specified period.
While POP3 is useful for offline access and managing local copies of emails, it lacks advanced features such as synchronization across multiple devices. For users who need real-time access and multi-device synchronization, IMAP (Internet Message Access Protocol) may be a better option.