A covered walk is a type of architectural structure that provides a sheltered path or walkway. The term can refer to four different types of structures: an ARCADE, a CLOISTER, a STOA, and a PERGOLA. An ARCADE is a series of arches supported by columns, while a CLOISTER is a covered walkway with a central open courtyard. A STOA is a covered walkway with a roof supported by columns, and a PERGOLA is a covered walkway with an open lattice roof.