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Glossary/Web Dev

What is Microservices?

An architectural style that structures an application as a collection of services that are highly maintainable and loosely coupled.

Deep Dive

Instead of one giant 'Monolithic' app (where the billing code is mixed with the user profile code), Microservices break the app into tiny, independent pieces.

This allows different teams to work on different parts of the app simultaneously without breaking each other's code. It's how Netflix and Uber scale.

Key Takeaways

  • Highly scalable and resilient.
  • Complex to manage (requires orchestration like Kubernetes).
  • Allows using different tech stacks for different services.
  • Contrast with 'Monolithic Architecture'.

Why This Matters Now

Think of a Monolith like a Swiss Army Knife. It does everything, but if the knife breaks, you have to throw the whole tool away. Microservices are like a tool belt: if the hammer breaks, you just buy a new hammer.

This architecture allows Amazon to update their 'Shopping Cart' service without touching their 'Product Reviews' service. It decouples risk.

Common Myths & Misconceptions

Myth

Microservices are always better.

Reality:No! For startups, they are often overkill. The complexity of managing 50 services can kill a small team. Start with a Monolith; break it up when you scale.

Myth

They must all use the same language.

Reality:False. The Billing service can be written in Java, and the Frontend in React. They talk via API (JSON), which is language-agnostic.

Real-World Use Cases

Resilience: If the 'Recommendations' service crashes on Netflix, the rest of the site works fine. You just don't see recommendations for a minute.

Scaling: On Black Friday, you can spin up 100 extra servers for the 'Checkout' service without wasting money scaling the 'About Us' page.

Frequently Asked Questions

What is Kubernetes?

It's the conductor of the orchestra. It manages all the microservice containers, restarting them if they crash and scaling them up if traffic spikes.

Are they slower?

They can be. Network calls between services (latency) add up. You need good monitoring to trace where the slowness is coming from.

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