What is shadow banking, please?

Shadow banking, generally divided into two kinds: one is not within the scope of bank supervision, but do the things of the bank, lending money to enterprises. Mainly some financial institutions, such as trust companies, insurance companies, asset management companies and so on. The other is that some commercial banks do not rest on their laurels, through some non-banking institutions, to do some things that are not within the scope of the bank's credit business, that is, the bank's shadow credit.