In fact, some of its capabilities directly overlap with what the ASA can do on its own.
The FirePOWER module for the Cisco ASA provides several next-generation firewall services. The Cisco Adaptive Security Appliance (ASA) can run a software or hardware module known as FirePOWER or SFR (short for Sourcefire) module. To operate a FirePOWER Module in a Cisco ASA there are specific steps that must be followed to allow communication with the FireSIGHT management center. How to register an ASA SFR module with the FirePOWER Management Center