It’s not easy to understand the distinction between all of these terms: Firepower, NGIPS, FireSight, and FirePower Management Center.
Firepower is the term Cisco uses for most of the products aquired from Sourcefire.
FMC
l Firepower Management Center aka Firesight Management Center aka Defense Center.
l Firepower Management Center has been re-branded two times, it’s all the same.
l Central Management for firepower devices (NGIPS, ASA Firepower Module, FTD)
Dedicated IPS appliance / IPS component of the firepower solution (also used on ASA Firepower module and FTD)
ASA with Firepower Services
ASA with software/hardware module running Firepower services. (= two different images running on the same box. Traffic is redirected to firepower module for layer 7 inspection)
FTD
Firepower Threat Defense is the new unified image combining ASA software and firepower software into a single image. (Not full feature parity to ASA yet)
NGFW
NGFW is the term used for firewalls that provide features up to layer 7 including IPS, AMP, URL Filtering, User Identity Integration etc... it’s basically just a marketing term used by vendors and is used for both ASA with Firepower Services and the new Firepower Appliances with run FTD in the Cisco world.
More info https://developers-club.com/posts/229343/
Cisco Firepower NGIPS Data Sheet
Learn more: Cisco Firepower NGIPS Series Migration Options
Migration Recommendations for Cisco IPS and FirePOWER-NGIPS Series
The Most Common NGFW Deployment Scenarios
Why NGFW and NGIPS are needed in network security infrastructure?