Type pairing is the practice of combining two, or occasionally three, typefaces in a single design so they support each other rather than compete — one typically carrying headlines with personality, the other carrying body copy with maximum legibility. Done well, pairing is invisible; a reader never consciously registers that two different typefaces are even present. Done poorly, it's one of the fastest ways to make a design look amateur, because clashing typefaces read as a lack of decision-making before a reader has processed a single word.