A bright and brassy jazz style typical of the southern US, especially New Orleans, in the first half of the 20th century. Dixieland jazz is related to ragtime, a somewhat earlier style.

Dixieland jazz is typically played by an ensemble including a banjo and lots of brass (a trombone and trumpet at the very least). Think of the jazzy versions of "When the Saints Go Marching In", a classic of Dixieland jazz, and you'll understand what Dixieland sounds like.