+A **wall** is a usually solid, upright structure that defines a space or serves as a [boundary](/wiki/Boundary). Often built of stone, brick, or concrete, it can offer [protection](/wiki/Protection), support, or simply delineate an area.
+## See also
+- [Building](/wiki/Building)
+- [Barrier](/wiki/Barrier)
+- [Fortification](/wiki/Fortification)