can you state any one feature of it?
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules
Firewall (computing)
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. 
what is the current version of symantec endpoint protection Version 12.1.2 what does it refers to? It  is a security software suite that consists of anti-malware, intrusion prevention and firewall features for server and desktop computers
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Firewall (computing) [SEP] Introduction
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.