Raster vs. Vector
We can print both raster and vector images. Vector images
are infinitely scalable graphics made up of paths, lines, and shapes. Vector graphics are commonly made in Adobe Illustrator and have file extensions .ai, .eps and .svg. Raster images
are made up of pixels and are commonly photographic. Raster images need to be 300dpi at print size for high-quality printing. There is not a clear answer on this, it depends on your project. Exporting as a PDF with high quality and no compression is typically your best bet.