> ACPI defines many tables that provide the interface between an ACPI-compliant operating system, and system firmware. This includes Differentiated System Description Table (DSDT), Secondary System Description Table (SSDT), and Static Resource Affinity Table (SRAT), for example.
As far as table contents, it's essentially an auxiliary DSDT (ACPI table defining variables, functions, interrupts, ...). An ACPI system has one DSDT and zero or more SSDTs.
