DOS uses a code page, or character set, to determine which font to use when displaying data. For instance, the United States character set is usually 437. If a program needs a particular character set, for instance a program that uses French characters, the character set is usually changed by the program itself through a BIOS call.
Windows uses a different system for displaying fonts. However, Windows also uses a code page, or character set, when displaying data in a DOS window. This character set corresponds to the Windows "Terminal" font. You can change the Windows character set when you set up Windows.