Problem Statement
Differentiate between IMAP and POP3 email retrieval protocols.
Explanation
POP3 downloads messages from the server and usually deletes them after download, allowing offline access but poor synchronization. IMAP keeps emails on the server, enabling access from multiple devices and real-time sync of folders. For modern multi-device email, IMAP is preferred. Mentioning their default ports (POP3 110, IMAP 143, with secure versions 995 and 993) adds detail for interviews.