In everyday terms

Risk-Return Tradeoff

The principle that potential return rises with an increase in risk. Low levels of uncertainty (low-risk) are associated with low potential returns, whereas high levels of uncertainty (high-risk) are associated with high potential returns. According to the risk-return tradeoff, invested money can render higher profits only if it is subject to the possibility of being lost.

Investopedia Explains:

Because of the risk-return tradeoff, you must be aware of your personal risk tolerance when choosing investments...