A stoa (/ˈstoʊə/; plural, stoas,[1] stoai,[1] or stoae /ˈstoʊ.iː/[2]), in ancient Greek architecture, is a covered walkway or portico, commonly for public use. Early stoas were open at the entrance with columns, usually of the Doric order, lining the side of the building; they created a safe, enveloping, protective atmosphere.