The AWS::Lambda::EventSourceMapping resource creates a mapping between an event source and an AWS Lambda function. Lambda reads items from the event source and triggers the function.

For details about each event source type, see the following topics. In particular, each of the topics describes the required and optional parameters for the specific event source.

EventSourceArn

The Amazon Resource Name (ARN) of the event source.

Amazon Kinesis – The ARN of the data stream or a stream consumer.

Amazon DynamoDB Streams – The ARN of the stream.

Amazon Simple Queue Service – The ARN of the queue.

Amazon Managed Streaming for Apache Kafka – The ARN of the cluster.

Amazon MQ – The ARN of the broker.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-eventsourcemapping.html