The discount rate is a number used to calculate the current value of future money. It considers the idea that money received in the future is worth less than money received today. The discount rate takes into account factors like risk, expected return, and the time value of money. It is usually expressed as a percentage and helps in determining the present value of future cash flows or monetary amounts. A higher discount rate means a higher level of risk or required return, while a lower discount rate indicates a lower level of risk or required return.