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AWS Lambda is an Amazon provided cloud service that lets you compute without provisioning a virtual machine. At present, you can write Lambda functions in Python, Java, Go, and NodeJS. It eliminates the need to manage infrastructure which eventually enables the developers to spend more time to do what they should be doing. The cost is calculated based on the execution of the Lambda function. The code is supposed to return a. JSON output. A Lambda handler function acts as an entry point to your lambda function.