bond funds are funds that invest in bonds, which are divided into pure debt base, primary debt base and secondary debt base.

corporate bonds broadly speaking, any kind of corporate bonds can be issued. In a narrow sense, corporate bonds approved by the National Development and Reform Commission and listed on the interbank market. It is different from the corporate bonds listed on the exchange market (bonds issued by listed companies) and the private debt of small and medium-sized enterprises filed by the CSRC (in fact, it is a kind of junk debt. Of course, junk debt does not mean that this bond is rubbish)