Symantec Endpoint Protection is a suite of security modules that are used inside large corporate networks to provide protection against zero-day threats, malware, trojans and any unsecure items that might cause damage to network. The software/platform is created to have full control of the files that are accessed on a network with layers of security and execution prevention. To understand better, Symantec Endpoint Protection is like a big antivirus program for a whole company. It has management, permission control, firewall, security on layers, etc.
You can find more info using the following link: https://www.symantec.com/endpoint-protection/