What different between Microsoft Sync Technology and ActiveSync

TAMSHUI 

As per my understanding.....

Microsoft Sync Technology will be used:

Within the Microsoft 365- or Office 365-based architecture, Outlook for iOS and Android uses the native Microsoft sync technology as the protocol for data synchronization.

Active Sync will be used:
Exchange ActiveSync is a Microsoft Exchange synchronization protocol that's optimized to work together with high-latency and low-bandwidth networks.
The protocol, based on HTTP and XML, lets mobile phones access an organization's information on a server that's running Microsoft Exchange.
Exchange ActiveSync enables mobile phone users to access their email, calendar, contacts, and tasks, and to continue to access this information while they're working offline.

Please refer below links for your reference.

https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-for-ios-and-android/outlook-for-ios-and-android 

https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/exchange-activesync/exchange-activesync 

Thank you,

Regards,
MD