Microservices Architecture

Microservices architecture structures an application as a collection of loosely coupled, independently deployable services. Each service owns its data and business logic, communicates over well-defined APIs, and can be developed and scaled independently.

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Monolith vs Microservices

Monolith:                              Microservices:

┌─────────────────────────┐            ┌────────┐  ┌────────┐  ┌────────┐
│                         │            │  User  │  │ Order  │  │Payment │
│  All modules in one     │            │Service │  │Service │  │Service │
│  deployable unit        │            └───┬────┘  └───┬────┘  └───┬────┘
│                         │                │           │           │
│  ┌──────┐ ┌──────┐     │                ▼           ▼           ▼
│  │Users │ │Orders│     │            ┌────────┐  ┌────────┐  ┌────────┐
│  └──────┘ └──────┘     │            │User DB │  │Order DB│  │Pay DB  │
│  ┌──────┐ ┌──────┐     │            └────────┘  └────────┘  └────────┘
│  │Pays  │ │Notify│     │
│  └──────┘ └──────┘     │            Each service owns its own database
│                         │            and can be deployed independently.
│     Single Database     │
└─────────────────────────┘

Comparison