CDJ is a term used to describe a CD player made by Pioneer Electronics, that operates similarly to a vinyl turntable for the purposes of DJing. Originally, the term referred to the CDJ-500 by Pioneer Electronics, but now includes the whole line of Pioneer CD-turntables.
The Pioneer CDJ-400, CDJ-800, CDJ-1000 (including the Mark 2 and Mark 3) have vinyl mode and a virtual platter that allows the operator to manually manipulate music on a CD as if it were on a turntable, while lesser models (CDJ-100S, CDJ-200) are essentially little more than plain CD players. While still having the options to manipulate the CD, they lack the accuracy and vinyl modes of the later models.
The CDJ-1000 was the main model to find mass usage in both clubs and amongst domestic users, especially from the second version of the model, the CDJ-1000MK2.
