Final answer:
An IAM Role is required for AWS Step Functions to send logs to Amazon CloudWatch Logs. The role must have the necessary permissions and be trusted by Step Functions to interact with CloudWatch.
Step-by-step explanation:
To allow AWS Step Functions to send logs to Amazon CloudWatch Logs, you need to provide an IAM Role. AWS Step Functions requires permission to interact with other AWS services on your behalf. You do this by creating an IAM role with the necessary permissions and then assigning this role to your step function. The role should have a trust relationship with Step Functions and include an IAM policy that grants permissions to put log events to CloudWatch Logs.
To set this up, you create the IAM role with a policy attached that grants the 'logs:CreateLogStream' and 'logs:PutLogEvents' permissions for CloudWatch Logs. You then specify this role when creating or editing a state machine in Step Functions.