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Explanation
AWS Lambda is a serverless compute service that runs code in response to events without requiring server provisioning or management. Developers upload functions written in supported languages, and Lambda automatically handles scaling, execution, and fault tolerance. Functions are triggered by events from AWS services such as object uploads, API requests, database changes, or scheduled events. Lambda charges are based on execution time and memory used, making it highly cost-effective for intermittent workloads. The service integrates natively with IAM for security and supports fine-grained permissions.
Table
| Aspect | Description |
|---|---|
| Function | Unit of execution |
| Trigger | Event source |
| Runtime | Language environment |
| Execution Time | Billed duration |
| Concurrency | Parallel executions |
Example
An image processing application uses AWS Lambda to resize images uploaded to object storage. When a file is uploaded, a Lambda function is triggered automatically. The function processes the image and stores the output. No servers are running when there are no uploads. Costs are incurred only during execution. The application scales automatically to handle spikes in uploads.
Use Cases
• Event-driven applications
• API backends and microservices
• Data processing and transformation
• Automation and scheduled tasks
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