A tooltip is a small pop-up window that appears when you hover your mouse over a particular element on a webpage. The tooltip contains additional information about the element, such as a description, definition, or usage example. In the case of the APY (?) tooltip, the additional information is likely to provide an explanation of what the APY stands for, which is Annual Percentage Yield. The APY is the rate of return on an investment over the course of a year, taking into account the effect of compounding interest.
