Securities are the general designation of various economic rights and interests certificates, and also refer to the special kinds of products, which are used to prove that the holders of the certificate holders have a particular interest. Mainly including capital securities, currency securities and commodity securities, etc.. Mainly refers to the narrow sense of the securities in the securities market securities, including property market products such as stocks, debt market products such as bonds, derived market products such as stock futures, options, interest rate futures.