This tag is for questions about foliations in differential geometry and use in conjunction with the tag (differential geometry).
A foliation of a smooth manifold is a particular decomposition into connected, injectively immersed submanifolds and, these submanifolds are called the leaves of the foliation. If all of these leaves are equidimensional then the foliation is called regular or, otherwise it is called a singular foliation. According to the Frobenius theorem, a regular foliation on a smooth manifold can be equivalently expressed as an integrable distribution on the tangent bundle.