Day-27: AWS Lambda & Serverless Basics

Summary

• AWS Lambda is a serverless compute service — you run code without managing servers.
• Just upload your code (Python, Node.js, Java, etc.), set triggers, and AWS handles scaling & execution.

⚙️ How It Works

• You write a function → upload to Lambda.
• It runs only when triggered (by S3, API Gateway, EventBridge, etc.).
• You pay only for execution time (not idle).

🧩 Key Concepts

• Trigger → Event that invokes the function (ex: file upload to S3).
• Handler → Entry point of your function.
• Timeout & Memory → Configurable limits per function.
• Layers → Reusable libraries or dependencies.

⚡ Benefits

• No server management.
• Automatic scaling.
• High availability.