=>A stateful firewall monitors and regulates the status of network connections as they travel through it. It keeps track of each connection's data, including the source and destination IP addresses.

=>NGFW (Next-Generation Firewall) has traditional firewall capabilities are integrated with new security features such as intrusion prevention, application control, URL filtering, and anti-malware protection in next-generation firewalls.

=>UTM (Unified Threat Management) It is a kind of security system that unifies several security features such as firewall, intrusion prevention, anti-virus and anti-malware, content filtering, and VPN into a single platform.