Microservices
Definition
An architectural style that structures an application as a collection of loosely coupled, independently deployable services organized around business capabilities.
Explain Like I'm New
Instead of building one gigantic mega-application (a Monolith) that handles Users, Products, Payments, and Emails all in one codebase, you chop it into pieces. You build 4 completely separate, tiny Node.js apps. App 1 ONLY handles Payments. App 2 ONLY handles Emails. They talk to each other over the network via HTTP or Message Queues.
Real World Example
Netflix. When you log in, that's the Auth Microservice. When it recommends movies, that's the AI Microservice. When you pay your bill, that's the Billing Microservice. If the AI Microservice crashes, Netflix still works, you just don't see recommendations.
Common Use Cases
- •Massive engineering teams
- •Apps with extreme scaling requirements
- •Polyglot environments (e.g., Auth is Node.js, AI is Python, Billing is Java)
Interactive Example
Interview Questions
basic
- What is the opposite of a Microservice architecture?
intermediate
- What is a major disadvantage of Microservices?