Twelve Factor App
In plain terms
A set of best practices for building portable, scalable cloud apps.
Going deeper
The Twelve-Factor methodology covers config, dependencies, statelessness, logs, and more, guiding apps to run cleanly on modern cloud platforms. Following it makes apps easier to deploy and scale.
Under the hood
Principles like config-in-environment, stateless processes, and disposability map cleanly onto containers and cloud platforms, easing horizontal scaling.
Examples
Env-var config, logs to stdout, declared dependencies, ephemeral processes, port binding.
Think of it like...
Like a building code for cloud apps: a checklist of construction standards that keeps the result safe to scale and easy to maintain.