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What does “Yield Curve” mean?
Great question!  A Yield Curve is a plot of the yields for different maturities of debt. This can be for any debt, but the most common used when discussing yield curves is the debt of the Federal Government. The yield curve is observed by its slope.  A curve with a positive slope (up and to the right) or a steepening curve, i.e. one that's becoming more positively sloped or less negatively sloped, may indicate several different situations. The Kansas City Federal Reserve has a nice paper that summarizes various economic theories about the yield curve, and even though it's a bit dated, the theories are still valid. I'll summarize the major points here. A positively sloped yield curve can indicate expectations of inflation in the future. The longer a security has before it matures, the more opportunities it has to be affected by changes in inflation, so if investors expect inflation to occur in the future, they may demand higher yields on longer-term securities to compensate them for the additional inflationary risk. A steepening yield curve may indicate that investors are increasing their expectations of future inflation. A positively sloped yield curve may also reflect expectations of deprecation in the dollar. The publication linked before states that depreciation of the dollar may have increased the perceived risk of future exchange rate changes and discouraged purchases of long-term Treasury securities by Japanese and other foreign investors, forcing the yields on these securities higher. Supply shocks, e.g. decreases in oil prices that lead to decreased production, may cause the yield curve to steepen because they affect short-term inflation expectations significantly more than long-term inflation. For example, a decrease in oil prices may decrease short-term inflation expectations, so short-term nominal interest rates decline. Investors usually assume that long-term inflation is governed more by fundamental macroeconomic factors than short-term factors like commodity price swings, so this price shock may lead short-term yields to decrease but leave long-term relatively unaffected, thus steepening the yield curve. Even if inflation expectations remain unchanged, the yield curve can still change. The supply of and demand for money affects the "required real rate," i.e. the price of credit, loans, etc. The supply comes from private savings, money coming from abroad, and growth in the money supply, while demand comes from private investors and the government. The paper summarizes the effects on real rates by saying Lower private saving, declines in the real money supply, and reduced capital inflows decrease the supply of funds and raise the required real rate. A larger government deficit and stronger private investment raise the required real rate by increasing the demand for funds. The upward pressure on future real interest rates contributes to the yield curve's positive slope, and a steepening yield curve could indicate an increasing government deficit, declines in private savings, or reduced capital coming in from abroad (for example, because of a recession in Europe that reduces their demand for US imports). an easing of monetary policy when is economy is already producing near its capacity ... would initially expand the real money supply, lowering required short-term real interest rates. With long-term real interest rates unchanged, the yield curve would steepen. Lower interest rates in turn would stimulate domestic spending, putting upward pressure on prices. This upward price pressure would probably increase expected inflation, and as the first bullet point describes, this can cause long-term nominal interest rates to rise. The combination of the decline in short-term rates and the rise in long-term rates steepens the yield curve.  Similarly, an inverted yield curve or a positively sloped yield curve that is becoming less steep may indicate the reverse of some or all of the above situations. For example, a rise in oil prices may increase expectations of short-term inflation, so investors demand higher interest rates on short-term debt. Because long-term inflation expectations are governed more by fundamental macroeconomic factors than short-term swings in commodity prices, long-term expectations may not rise nearly as much as short term expectations, which leads to a yield curve that is becoming less steep or even negatively sloped. Forecasting based on the curve slope is not an exact science, just one of many indicators used.  Note - Yield Curve was not yet defined here and was key to my answer for What is the "Bernanke Twist" and "Operation Twist"? What exactly does it do? So I took the liberty of ask/answer.