What are Microservices?

What are Microservices?

Microservices is an architectural style where an application is built as small, independently deployable services — each owning its data and communicating over APIs.

• Each service does one thing well
• Independent deployment per service
• Technology freedom per service
• Scale individual services by demand

# Monolith vs Microservices
Monolith:      one codebase, one DB, one deployment
Microservices: many services, each with own DB

# E-commerce example
user-service    -- accounts, auth
product-service -- catalogue, inventory
order-service   -- order lifecycle
payment-service -- billing
notification    -- emails, SMS