Creating a Lambda Function

• Console: Choose "Create Function," configure settings (name, runtime, execution role).
• CLI: Use aws lambda create-function with necessary parameters like -function-name, -runtime, and -role.
• CDK: Define Lambda function in your infrastructure code using a supported language (e.g., Node.js, Python).

Invoking a Lambda Function

• Manually (Console): Trigger the function with a test event.
• CLI: Use aws lambda invoke with the payload in JSON format.
• SDKs: Invoke using AWS SDKs (Node.js, Python, etc.) with lambda.invoke.
• Event-based: Lambda functions can be triggered by other AWS services like API Gateway, S3, or CloudWatch Events.

Invocation Types

• Synchronous: Lambda waits for the result and returns it to the invoker (e.g., API Gateway).
• Asynchronous: Lambda queues the event for processing later (e.g., SNS, SQS).
• Event Source Mapping: Automatically invokes Lambda when new events are available in the source, like an SQS message.