Here Is the Answer:
The Simple Network Management Protocol (SNMP) introduced community strings for security purposes. A shared secret was used to authenticate messages. This feature allowed devices to securely communicate with each other by verifying their identities through the shared secret. This was a significant step in improving network security as it prevented unauthorized access to network devices and ensured that only authorized parties could manage network resources. The use of community strings has since become a standard feature in many network management systems.