An SNMP (Simple Network Management Protocol) manager is a software application that manages and monitors network devices and systems that are configured to use SNMP. It is responsible for collecting and analyzing data from these devices to give information on their performance, availability, and health. SNMP managers can also monitor network traffic, configure network devices, perform maintenance tasks, and send alerts if any issues are detected. They usually have a user-friendly interface that allows network administrators to easily manage and configure SNMP-enabled devices on their network.