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@font-face {
font-family: '...';
src: url('#') format('...');
font-weight: ;
font-style: ;

Like mentioned previously, font-family: can be used for generic font classes (serif, sans-serif, and monospace) and also for specific font family names.

Using @font-face, fonts can be named in relation to their files. This can be the same for the whole family (i.e. font-family: 'Playfair Display') or specific to different variations (i.e. font-family: 'Playfair Display Bold') depending on how the rule is structured.