A walled garden refers to a controlled and isolated digital environment, typically created by a single company or platform, where users are limited to accessing only the content and services provided within the walls. This term is often used to describe closed ecosystems such as app stores, social media platforms, and streaming services, where the company has complete control over what is available and how it is presented to users. While walled gardens can provide a curated and streamlined experience, they can also restrict user choice and limit competition.