GDI stores information about the physical font in font files. The font file consists of a header and a bitmap. The font-file header contains a detailed description of the font. If the font file is a raster file, the font-file bitmap contains actual representations of the font characters. If the font file is a vector file, the font-file bitmap contains character strokes for the font characters. A font resource is a collection of one or more of these physical-font files.