  A general type of localized excitations, folded solitary waves and foldons,
are defined and studied both analytically and graphically. The folded solitary
waves and foldons may be "folded" in quite complicated ways and possess quite
rich structures and abundant interaction properties. The folded phenomenon is
quite universal in the real natural world. The folded solitary waves and
foldons are obtained from a quite universal formula and the universal formula
is valid for some quite universal (2+1)-dimensional physical models. The
"universal" formula is also extended to a more general form with many more
independent arbitrary functions.
