Swing music began in the 1920s, with its prime era between 1935-1945, and was one of the most popular styles of American music until shortly after World War Two. Swing Jazz relies on a larger backing rhythm section (comprised of drums, guitar, bass (stand-up or electric), piano or organ, and sometimes a tuba, in varying groupings) than other Jazz styles. This lays the groundwork for the 'lead' section, usually including brass (e.g. trombone, trumpet) and woodwinds (e.g. saxophone, clarinet). Creative and intricate soloing takes the fore on the bandleaders instrument of choice, giving each song its particular character. Swing is an up-tempo music that is highly danceable, its most famous dance perhaps being the Jitterbug.
[I dunno, dawgs. This sorta sounds like Big Band to me, but RYM categorizes it as swing so whatvz.]