Symantec Scan Engine is for content scanning network attached storage/filers/net apps, etc..You can check the guide here
https://www.symantec.com/business/support/index?page=content&id=DOC4615&key=55108
Symantec Endpoint Protection is a client-server solution that protects laptops,
desktops, Mac computers, and servers in your network against malware. Symantec
Endpoint Protection combines virus protection with advanced threat protection
to proactively secure your computers against known and unknown threats.
Symantec Endpoint Protection protects against malware such as viruses, worms,
Trojan horses, spyware, and adware. It provides protection against even the most
sophisticated attacks that evade traditional security measures such as rootkits,
zero-day attacks, and spyware that mutates. Providing low maintenance and high
power, Symantec Endpoint Protection communicates over your network to
automatically safeguard computers against attacks for both physical systems and
virtual systems.