What is the difference between EC2 and Lambda in AWS?

 

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Great question! Both EC2 and Lambda are compute services in AWS, but they serve very different purposes and are used in different scenarios.

EC2 (Elastic Compute Cloud)

• Think of EC2 as a virtual machine (like a server in the cloud).

• You choose the OS, install what you need, and manage it like a physical server.

• Ideal for apps that need full control over the environment, consistent performance, or long-running processes.

• Examples: web servers, databases, custom applications, game servers.

Lambda (Server less Function)

• AWS Lambda lets you run code without provisioning or managing servers.

• You just upload your function, set a trigger (like an API call or file upload), and AWS runs it when needed.

• Great for event-driven tasks, like image processing, API backends, or cron jobs.

• Only runs when triggered — and you’re billed only for the compute time used.

When to Use Which?

• Use EC2 when:

  • You need full control over the environment.

  • Your app needs to run 24/7.

  • You have complex dependencies or need custom networking.

• Use Lambda when:

• You want to minimize infrastructure management.

• Your tasks are short-lived or event-based.

• You need fast, automatic scaling without setup.

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