AWS Lambda is Amazon's flagship serverless computing platform that allows developers to run code without provisioning or managing servers. The service automatically handles the underlying infrastructure, scaling, and maintenance, enabling developers to focus purely on writing and deploying their application logic. Lambda supports multiple programming languages including Python, Node.js, Java, C#, Go, Ruby, and custom runtimes. It integrates seamlessly with other AWS services like API Gateway, S3, DynamoDB, and CloudWatch, making it ideal for building event-driven applications, microservices architectures, and real-time data processing pipelines. The platform operates on a pay-per-execution model where you only pay for the compute time your code actually consumes, measured in milliseconds. This makes it extremely cost-effective for applications with variable or unpredictable traffic patterns. Lambda automatically scales from zero to thousands of concurrent executions based on incoming requests. Key features include automatic scaling, built-in fault tolerance, integrated monitoring through CloudWatch, and support for both synchronous and asynchronous execution patterns. Lambda is particularly well-suited for API backends, data processing workflows, scheduled tasks, and IoT applications where traditional server management would be overkill.