Dow Jones CDX Indexes

What Does Dow Jones CDX Indexes Mean?
A series of indices that track North American and emerging market credit derivative indexes. The purpose of the combined indexes is to track the performance of the various segments of credit derivatives so that the overall return can be benchmarked against funds that invest in similar products.

Investopedia explains Dow Jones CDX Indexes
This family of indices comprises a basket of credit derivatives that are representative of certain segments such as North American investment grade credit derivatives, high volatility, high yield, high yield non-investment grade, as well as emerging markets.