What is the difference between a Sensor, the Agent and a Plugin?
The term sensor refers to software and hardware that is installed in local networks to collect and send data. Sensors are also known as probes. The Agent is the process that runs on Sensor to collect and send data to the Server. A Plugin is a piece of software coupled with the Agent to extend its functionality. A plugin knows the format of a specific system log (e.g. a firewall, an IDS etc) and allows collecting data from it.