What is GDI printer?
A printer that has built-in support for Windows Graphical Device Interface (GDI). GDI is used by most Windows applications to display images on a monitor, so when printing from a Windows application to a GDI printer, there is no need to convert the output to another format such as PostScript or PCL. GDI printers are sometimes called host-based printers because they rely on the host computer to rasterize pages.