Schematic is created as the first step of a PCB design. It includes graphic symbols of the electrical connections and functions of the circuit board.
CAM files are the files provide the information for printed circuit board manufacturing.
CAD, Computer Aided Design, refers to the software used by a PCB designer to create the data for manufacture and assemble circuit board and components.
CAM, Computer Aided Manufacturing, refers to the software used by PCB manufacturers’ engineer to prepare engineering files for PCB manufacturing process.