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APIC
In computing, an Advanced Programmable Interrupt
Controller (APIC) is a more complex Programmable
Interrupt Controller (PIC) than Intel's original types
such as the 8259A. APIC devices permit more complex
priority models, and Advanced IRQ (Interrupt Request)
management.
In computing, a programmable interrupt controller (PIC)
is a device that is used to combine several sources of
interrupt onto one or more CPU lines, while allowing
priority levels to be assigned to its interrupt
outputs. When the device has multiple interrupt outputs
to assert, it will assert them in the order of their
relative priority
source : http://en.wikipedia.org/wiki/Advanced_Programmable_Interrupt_Controller