The word "DJ" is an abbreviation for "Disc Jockey", which first appeared around the 1930s in the US. "Disc" means a music disc (at that time it was a vinyl record), and "jockey" is the operator.

Initially, DJs were just people who played pre-recorded music. However, over time, their role has evolved significantly.
From simply selecting and playing music, so-called DJs gradually became real artists, performing live at clubs, music festivals and major events.
Modern DJs use a variety of technologies such as turntables, mixing software, and electronics to create an immersive musical experience. With the rise of electronic dance music (EDM), DJs have become global icons and an integral part of the contemporary music scene.
Source: https://vtcnews.vn/90-nguoi-viet-hieu-sai-tu-dj-nghia-thuc-cua-no-la-gi-ar947204.html
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