How did the characters played by Spencer Tracy and Katharine Hepburn differ in Woman of the Year?

In the 1942 film Woman of the Year, directed by George Stevens, the characters played by Spencer Tracy and Katharine Hepburn are defined by their contrasting backgrounds and professional roles. Tracy portrays a "gruff sportswriter," while Hepburn plays an "upper-crust political columnist." The film’s plot centers on the dynamic between these two distinct personalities as the sportswriter attempts to woo and marry the columnist.1