Next.js 14 App Router Explained

The New Era of Next.js

The App Router represents the biggest update to Next.js. It introduces React Server Components by default.

Server Components vs Client Components

By default, everything in the app directory is a Server Component. This means zero bundle size for those components! You opt-in to client-side interactivity with the "use client" directive.

This shift requires a new mental model but offers incredible performance benefits.