Beginning in the late 1920s and early 1930s, swing was developed from jazz, using large bands and vocal aspects that had improvisation. It's upbeat and intense music created not just a genre, but an era. From sing came new fashion styles, dances, and slang (1).
Later on, another diversion of swing - Western swing music- became popular in the 1940s. This subgenre is different from swing jazz as it is a combination of rural, cowboy, polka, folk, Dixieland jazz and blues blended with swing, and mostly played by a string band (2). This is different from the swing music in the 30s, however, it is still important to the overall contribution to society and culture. As it was popular during the war, it is reminiscent of happier times before the Great Depression and the war.
Swing music, in general, had strong impacts towards western society at the time. Like jazz, it attracted the attention of all races specifically black, white, and latin/hispanic (1) which drove against inequities at the time and also united different culture significantly. As the popularity declined during the 40's, it's effect on pop culture was still important towards developing fashion, slang, and dances later on. Swing also lead to other genres such as bebop and western swing music further developed into subgenres of country,
(1) "Tap your Knowledge Box The Swing Era." Between the Wars. Accessed February 15, 2018. http://chnm.gmu.edu/courses/hist409/swing.html.
(2) Sallis, James, ed. The guitar in jazz: an anthology. Lincoln: University of Nebraska Press, 1996