Commercial paper is a short-term unsecured promissory note issued by highly rated corporations, primary dealers, and financial institutions to raise funds. It was introduced in India in 1990 to provide corporate borrowers and investors an additional short-term borrowing and investment instrument. Commercial paper can be issued for a minimum of 7 days to a maximum of one year. Eligible issuers include corporates, primary dealers, and financial institutions, while eligible investors include individuals, banks, corporations, NRIs, and FIIs.