Applications
You can use either the Secure Firewall ASA or the Secure Firewall Threat Defense (formerly Firepower Threat Defense) application on your hardware platform:
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ASA—The ASA is a traditional, advanced stateful firewall and VPN concentrator.
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Threat Defense—The threat defense is a next-generation firewall that combines an advanced stateful firewall, VPN concentrator, and next generation IPS.
Cisco provides ASA-to-threat defense migration tools to help you convert your ASA to the threat defense if you start with ASA and later reimage to threat defense.
To reimage between the ASA and the threat defense, see the Cisco Secure Firewall ASA and Secure Firewall Threat Defense Reimage Guide.