SNTP Vs. NTP - What Is The Difference?

While reading the detailed and instructive NTP / Network Time Guide For Video Surveillance, I came across the following statement:

The most commonly used time protocol in surveillance (and the IT industry at large) is SNTP (Simple Network Time Protocol) which is a less complex version of NTP...

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**** *********** ************* *******:

**** ********* ********* *** ******* *** *********’ ****** *** ************. A **** ******** ** *********** *** *********** *** **** ********* time *********** *** ********** *** ****** ** ****** **** * consistent **** ** ********** ** ******** *******.The ******* **** ******* **** *** ******* **** ******** (***) to help synchronize time across a network. NTP is an Internet time protocol that includes the discipline algorithms necessary for synchronizing clocks. NTP ** * **** ******** **** ******** **** *** ****** ******* **** ******** (****) **** ** **** ** **** ******** ** *******; however W32Time continues to support SNTP to enable backward compatibility with computers running SNTP-based **** ********, **** ** ******* ****.

******* **** ******** (***) ** *** ******* **** *************** ******** used ** *** ******* **** ******* ** *** ********* ******.NTP ** * *****-********, ****** ******** **** ******** *** ** *** ******** used **** ***** *** ************* ******** ****** ** ***** * ********** **** *********. NTP time synchronization takes place over a period of time and involves the transfer of NTP packets over a network. NTP packets contain time stamps that include a time sample from both the client and the server participating in time synchronization. NTP relies on a reference clock to define the most accurate time to be used and synchronizes all clocks on a network to that reference clock. NTP uses Coordinated Universal Time (UTC) as the universal standard for current time. UTC is independent of time zones and enables NTP to be used anywhere in the world regardless of time zone settings.