A line that plots the interest rates, at a set point in time, of bonds having equal credit quality, but differing maturity dates. The most frequently reported
yield curve compares the three-month, two-year, five-year and 30-year U.S. Treasury debt. This yield curve is used as a benchmark for other debt in the market, such as mortgage rates or bank lending rates. The curve is also used to predict changes in economic output and growth.
Read more: Yield Curve Definition | Investopedia
https://www.investopedia.com/terms/y/yieldcurve.asp
See also:
https://en.wikipedia.org/wiki/Yield_curve