Can anyone introduce the origin of Jazz music to me ?

Recordings of Jazz did not begin until 1917. Even the geographic location of the earliest Jazz experiments and the parties involved have been the subject much controversy. Many Jazz writers have pointed out that the non-Jazz elements from which Jazz was formed, the Blues, Ragtime, Brass Band Music, Hymns and Spirituals, Minstrel music and work songs were ubiquitous in the United States and known in dozens of cities. Why then, they reason, should New Orleans be singled out as the sole birthplace of Jazz? These writers are overlooking one important factor that existed only in New Orleans, namely, the black Creole subculture. The Creoles were free, French and Spanish speaking Blacks, originally from the West Indies, who lived first under Spanish then French rule in the Louisiana Territory. They became Americans as a result of the Louisiana Purchase of 1803 and Louisiana statehood in 1812. The Creoles rose to the highest levels of New Orleans society during the 19th century. They lived in the French section of the city east of Canal Street and became prominent in the economic and cultural life of the section.

It was originally called Jass but became Jazz - the style was developed by black musicians/bands in New Orleans and the South. The first jazz recording was made in 1917.

Jazz is an original American musical art form which originated around the beginning of the 20th century in African American communities in the Southern United States out of a confluence of African and European music traditions

that's correct.