Dev.to
7/6/2026

The original title is "AWS for Newbies — Episode 3: The Magic Helper Booth"
Original: AWS for Newbies — Episode 3: The Magic Helper Booth
Short summary
AWS Lambda is a serverless computing service that runs code only when triggered by events (like file uploads), eliminating idle-server costs. Execution is instant for frequent triggers (warm starts) but has initial delays on first invocation (cold starts). Each execution is stateless—variables never persist between runs, so you cannot rely on the Lambda function remembering anything from prior executions.
- •Lambda executes code on-demand triggered by events, charging only for actual execution time
- •Cold starts cause initial latency; warm starts are instant if the container is still active
- •Executions are stateless—no variable persistence between invocations
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