A DWG file is a database of 2D or 3D drawings created with AutoCAD. It contains vector image data and metadata describing the contents of the file. DWG files are related to .DXF files, which are ASCII versions of DWG files.
A SLDPRT file contains a 3D part created in the SOLIDWORKS design software.
Multiple SLDPRT parts can be independently modified and combined into a single SLDASM assembly file. If one SLDPRT part belongs to several assemblies, then after modifying it, the changes will appear in all assemblies.
SLDPRT are proprietary files with closed specifications. Nevertheless, some APIs (like CAD Exchanger SDK) provide the facility to read and convert them to other formats.
In addition to SOLIDWORKS software, SLDPRT files are supported by Autodesk Fusion 360.
A CAD file is an output of a CAD software, containing key information about the designed object: its geometry and topology representation, 3D model hierarchy, metadata, and visual attributes depending on the format of the file.Read more
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