Geometry of nearly C-manifolds

In this thesis, we introduced nearly C-manifold which is a class of nearly manifolds. Then we give some non-trivial examples to clarify some properties. On the other hand, we investigate some submanifolds of these manifolds. We search whether the properties of nearly C-manifolds are invariant under some D-conformal transformations. On this new class of manifolds, we consider Ricci solitons and we give some classifications of them. We consider nearly C-manifold as a submanifold of a generalized S-space form. On the other hand, we give some classifications of nearly C-submanifold.