The NGFW (Next-Generation Firewall) and the UTM (Unified Threat Management) appliances are different types of firewalls. The UTM is a multipurpose type of appliance that can be used to perform other functions such as gateway anti-spam, gateway antivirus protection, network load balancing, appliance reporting, network intrusion detection and prevention, URL filtering, email security, content filtering, web application firewall, wireless security, DDOS mitigation, reduced compliance burden, accelerated performance etc.”]
Source: https://hackercombat.com/utm-vs-firewall-know-the-difference-to-choose-the-right-protection/