Why Palo Alto is being called as next generation firewall ?

Next-generation firewalls include enterprise firewall capabilities, an intrusion prevention system (IPS) and application control features. 

Palo Alto Networks delivers all the next generation firewall features using the single platform, parallel processing and single management systems, unlike other vendors who use different modules or multiple management systems to offer NGFW features.

Palo Alto NGFW different from other venders in terms of Platform, Process and architecture