Musically, swing is distinguished by a characteristic movement of the rhythm section and a type of execution of notes with a 'jumping' rhythm. To put it simply, it is a kind of pulsation, a bounce as we have said, a rhythmic cadence that continues to carry the rhythm forward, as if there were a delay on some beats and as if other beats were faster.
In jazz jargon, 'to swing' (or to swing) means to be musically expressive and communicative: the swinging, or sliding, is created by placing the accent on the upbeat, instead of the beat. And so, if in a normal folk song of the time in 4/4 the feeling will be this: ONE two THREE four, in a swing song in 4/4 the feeling will be different, just by shifting the accent: one TWO three FOUR.