WSO2 Analytics Platform has the capability of receiving/sending events from event sources/sinks via various transport protocols. An analytics extensions cater the requirement of connecting various event sources/sinks that are not out of the box available in WSO2 Analytics Platform.
Input event adapters are used to receive events from event sources. For example if you want to use rabbitmq server as event source, you can use rabbitmq event input adapter to receive events.
Output event adapters are used to send events to event sinks. For example if you want to persist the data in HBase database, you can use HBase output event adapter to send events.
The following is a complete list of analytics extensions.