Walled

Walled is an adjective used to describe something that is enclosed or bounded by a wall. The term is commonly applied in architectural, urban, and horticultural contexts, as well as in modern discussions of digital ecosystems. Historically, walled structures and settlements were built for defense or privacy, with walls serving as physical barriers and symbols of status. In urban planning, a walled city refers to a city or town whose perimeter is defined by defensive walls, often surrounding a historic core; notable examples include Avila in Spain and the old city of Jerusalem.

In horticulture, a walled garden is a garden set within walls that create a microclimate, protect against wind and pests, and regulate temperature and humidity. Walled gardens were popular in medieval to early modern estates, where they supported the cultivation of delicate fruits and vegetables.

In contemporary technology and media, the term walled garden describes a closed ecosystem controlled by a single company, in which content, apps, and services are restricted to that provider’s platform. Such ecosystems can offer integrated user experiences but may limit interoperability and choice.

The word often implies intentional enclosure for defense, privacy, control, or exclusivity, rather than incidental boundary rules. See also enclosure, fortification, garden, and walled garden in technology.