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AWS Lambda is Amazon's serverless compute service. You upload your code, configure a trigger, and Lambda runs your function in response to events — scaling automatically from zero to thousands of concurrent executions. There are no servers to provision, no operating systems to patch, and no capacity to plan.
When an event triggers a Lambda function, the following sequence occurs:
Event Source Lambda Service Execution Environment
+-----------+ +----------------+ +---------------------+
| API GW | -----> | Invoke API | -----> | Init runtime |
| S3 Event | | Route event | | Load function code |
| SQS Msg | | Scale if | | Execute handler() |
| Schedule | | needed | | Return response |
+-----------+ +----------------+ +---------------------+
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