🌐 4. What is Serverless?
Serverless is a modern cloud computing paradigm where developers focus on writing code without worrying about server management, provisioning, or scaling. AWS automatically provisions and scales the resources as needed.
| Feature | Description |
|---|---|
| No Server Management | Developers don't manage or provision servers. |
| Automatic Scaling | AWS scales resources automatically based on demand. |
| Pay per Execution | You only pay when your code runs. |
| Event-Driven | Code runs in response to events or triggers. |
| Stateless | Each function invocation is independent. |
🧠 Concept Overview
- Developers deploy code or functions, not servers.
- Originally: Serverless = Function as a Service (FaaS) — pioneered by AWS Lambda.
- Now: The term includes fully managed services like databases, messaging, and storage.
- Note: There are still servers behind the scenes — you just don’t manage or see them.
🧩 Examples of Serverless Services
| Service | Type | Description |
|---|---|---|
| Amazon S3 | Storage | Upload files without managing any server; scales automatically. |
| Amazon DynamoDB | Database | Create tables that auto-scale without provisioning servers. |
| AWS Fargate | Containers | Run Docker containers without managing EC2 instances. |
| AWS Lambda | Compute | Run functions in response to events — the pioneer of Serverless. |
💡 Summary
Serverless = Managed + Scalable + No Infrastructure Management
- Developers focus on code, not servers.
- Ideal for event-driven, stateless applications.
- Introduced by AWS Lambda, now extended across multiple AWS services.