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What's the difference between vector pdf and raster pdf?
Vector PDF uses math to draw shapes using points, lines and curves. Typically electrically created PDF originally from CAD program, or published/converted from CAD drawing files.
Raster PDF is an image made of hundreds (or thousands or millions) of tiny squares of color information, referred to as either pixels or dots, typical scanned PDF, or photos in a PDF.
If you open a PDF, zoom in to most details level and still see smooth lines you are seeing vector PDF. If the zoom in reveals jaggy lines it is raster PDF.
