An SNMP scanner is a tool used to discover and collect information from Simple Network Management Protocol (SNMP) enabled devices such as routers, switches, and servers. It allows network administrators to monitor and manage their network devices by retrieving data such as device status, network traffic, and performance metrics. The scanner sends SNMP requests to the devices and receives responses, which are then analyzed and presented to the user in a user-friendly format. This tool is essential for network management and troubleshooting.