What is AWS Lambda?

AWS Lambda is a serverless compute service that runs code in response to events without requiring server management. It automatically scales applications by running code in response to triggers such as API requests, file uploads, or database changes. Lambda supports multiple programming languages including Python, Node.js, Java, Go, and .NET. You only pay for the compute time consumed, with no charges when code is not running. Lambda functions can process data, respond to HTTP requests via API Gateway, and integrate with other AWS services. It eliminates infrastructure management overhead and provides automatic high availability and fault tolerance.