A font catalog or font catalogue is a collection of specimen of typefaces offering sample use of the fonts for the included typefaces. Usually it is in the form of a printed book. However, the definition can also apply to websites offering a specimens collection similar to what a printed catalog provides.
The goal of a font catalog is to aid a typesetter or graphical designer to choose an appropriate typeface or narrow down candidates for the typesetting or design process without having to make expensive or labor-intensive proof prints. A font plays also an important role in the selection process of purchasing typefaces.