1. What is the purpose of parentheses in folder names like (marketing) in the App Router?
Difficulty: HardType: MCQTopic: Route Groups
Wrapping a folder name in parentheses like (marketing) creates a route group that organizes routes logically without adding the folder name to the URL path, allowing multiple layouts for different sections or organizing routes by feature. Route groups enable having different layouts for different route segments without affecting URLs, opting specific routes into different layouts, and splitting your application into sections for better code organization. For example, app/(marketing)/about and app/(shop)/products both appear at /about and /products in the URL while having different layouts from their respective group folders.