What is an intranet security management system? Which is better?

At present, there are many companies doing intranet security systems in China. In fact, they are almost the same in technology, mainly because of their different characteristics, and each has its own advantages in operability, mainly to choose the system that best suits the company's own needs. I choose to provide a few I know now (in no particular order): Shenzhen Hongande DLP data leakage protection system, Zhongke, Guomai, Beixinyuan, Lenovo Netgear, Shengborun, Lansex (Lensek, Shandong Huaruan Jindun Software, Aode, Wuhan Tianyu, Shen Xin Technology, Lumeng Technology). Basically every family has peripherals (USP storage devices, printers, etc. ) control and network transmission control.