A few years ago, next-generation firewalls came out of nowhere to become a network security staple. NGFWs combined traditional L3/L4 packet filtering with deep packet inspection, IPS, and other network security services along with knowledge about users and applications. As cloud computing, SaaS, mobility and broadband networks evolved, mobile and remote worker connection are often dual homed, offering direct connections to the public internet. Software-based micro-segmentation tools (i.e. Cisco ACI, CloudPassage, Illumio, Unisys, vArmour, VMware NSX, etc.) are also using it to replace, you guessed it.”]
Source: https://www.csoonline.com/article/3194950/are-next-generation-firewalls-legacy-technology.html