Although the US is officially divided into 9 time zones, the quantity of the time zone IDs is much bigger. Pacific/Pago Pago is one of them. This identifier shows what time is it in exact location now. In this case it is about the time in the US territory.
Pacific/Pago Pago time now
You can see the current time and date of Pacific/Pago Pago time zone here:
Current time in Pago Pago, AS?
Since the time in Pago Pago is taken as the basis for the identifier Pacific/Pago Pago, the current time in this area is the same:
Standard time of Pacific/Pago Pago
STD of Pacific/Pago Pago is UTC -11:00 (SST)
Standard time is the local time in Pacific/Pago Pago time zone when DST (Daylight Saving Time) is not in use.
Daylight Saving Time of Pacific/Pago_Pago
DST of Pacific/Pago Pago is UTC -11:00 (SDT)
It means that Daylight Saving Time is not observed in this location.
Daylight Saving Time is not used in any US territories, but it is actively observed in most states, as well as outside the USA.
Read more about “Abbreviations for Time Zones, names and locations” which are used for identification of Coordinated Universal Time, like EDT, CEST EST, AKDT and others.
Pacific/Pago Pago time zone
Pacific/Pago_Pago is the ID which refers to Samoa Time Zone. Its borders and the states which included to this time zone can be seen on the map of US time zones.