The term describes a process where email data is consistently updated and matched across multiple devices and servers. This ensures that actions taken in one location, such as reading, deleting, or sending an email, are reflected identically on all other connected platforms. For instance, if a user reads a message on their phone, it will be marked as read on their desktop computer and webmail interface as well.
This synchronization offers considerable advantages, including data accessibility and consistency. Users can access their most current email information from any location and device, eliminating discrepancies and potential confusion. Historically, email was often tied to a single machine, creating significant limitations for users needing access from multiple points. Modern email systems have largely overcome this constraint through robust synchronization mechanisms.