Answer:
This term is usually used in the field of Investment to signify the relation between these two terms. The terms risk and returns are usually directly proportional.
Instruments that are high risk usually provide high returns whereas instruments that are low risk provide low returns.
Ex:
Bank deposits are extremely safe (Very low risk) but they provide a return of around 8% per year
Stock market investments are very risky but they provide a high return (Usually 15-20% or even more during bull markets and -ve returns during bear markets or depressions)