Provided is a package including a die, a redistribution layer (RDL) structure, and a plurality of conductive connectors. The RDL structure includes a dielectric layer, a conductive feature, and a protective layer. The conductive feature is disposed in the dielectric layer and electrically connected to the die. The protective layer is disposed between the dielectric layer and the conductive feature. The protective layer, the dielectric layer, and the conductive feature have different materials. The plurality of conductive connectors are electrically connected to the die through the RDL structure.