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AWS Lambda: How Amazon's Serverless Compute Service Works and When to Use It

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AWS Lambda, launched by Amazon in 2014, is a serverless compute service that runs code in response to events without requiring users to manage any underlying infrastructure. It has become the most widely used AWS compute service after EC2, handling scaling, availability, monitoring, and patching automatically. Each function execution follows a lifecycle that includes either a cold start — involving code download, micro-VM creation, and runtime bootstrap — or a faster warm start that reuses an existing environment. Lambda supports multiple programming languages and offers configurable memory from 128 MB to 10 GB, with execution timeouts of up to 15 minutes. Pricing is based on the number of invocations and memory-duration usage, with a free tier covering one million invocations and 400,000 GB-seconds per month.

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