38:54 What Is Serverless?
Serverless Computing
Serverless computing lets you run code without managing servers. You write functions, deploy them, and the cloud provider handles scaling, availability, and infrastructure. You only pay for actual execution time — zero cost when idle.
How Serverless Works
AWS Lambda, Cloudflare Workers, Vercel Functions, and Google Cloud Functions are serverless platforms. You deploy a function that handles HTTP requests, processes queue messages, or runs on a schedule. The platform auto-scales from zero to thousands of instances.
Serverless doesn't mean no servers — it means you don't manage them. The tradeoff: you gain infinite scaling and zero-idle cost, but you lose control over the runtime environment and face cold start latency.
Why Developers Use Serverless
Serverless is ideal for APIs, webhooks, scheduled tasks, file processing, and event-driven workloads. It's the default deployment model for many modern applications — Vercel, Netlify, and Cloudflare all use serverless under the hood.
Key Concepts
- Function as a Service — The core serverless model — deploy individual functions that the platform runs on demand
- Cold Start — Initial latency when a serverless function hasn't been called recently and needs to spin up a new instance
- Event-Driven — Serverless functions are triggered by events — HTTP requests, queue messages, file uploads, schedules
- Pay-Per-Use — You're billed per invocation and execution time — no charges when your function isn't running
Learn Serverless — Top Videos
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Frequently Asked Questions
When should I not use serverless?
Avoid serverless for long-running processes (>15 min), WebSocket connections, GPU workloads, or applications needing persistent local state. Traditional servers or containers are better for these cases.
Is serverless cheaper than traditional hosting?
For sporadic, bursty workloads — yes, much cheaper. For steady high-traffic workloads, traditional servers can be more cost-effective. Calculate based on your expected request volume.
Want a structured learning path?
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