Rails
In plain terms
A convention-driven Ruby web framework.
Going deeper
Ruby on Rails accelerates development with strong conventions, an ORM, and scaffolding, embodying 'convention over configuration.' It popularized rapid web development.
Under the hood
Productive defaults speed building but can feel magical/opaque; great for CRUD-heavy apps.
Examples
Startups, GitHub, Shopify, Basecamp, CRUD web apps.
Think of it like...
Like a prefab house kit with sensible defaults so you build fast.