Deposit certificates include: large negotiable deposit certificates, interbank deposit certificates, etc. The CD that investors can buy should be large negotiable certificates of deposit, which refers to the large certificates of deposit issued by banking deposit financial institutions for individuals, non-financial enterprises, government organizations and so on. Different from ordinary certificates of deposit, large certificates of deposit can be transferred in advance, with a term of not less than 7 days, a high investment threshold and an integer amount.