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Currency indices traditionally measure the value of a specific currency against a basket of other currencies. Currency indices are mostly constructed on a trade-weighted basis and are used by central bankers and other policymakers to gauge the value of their domestic currency against the others.

The Dollar Index is a measure used to evaluate the relative worth of the U.S. dollar in a collection of major currencies. It derives its value by calculating the weighted average of exchange rates involving six currencies: the euro, Japanese yen, British pound, Canadian dollar, Swedish krona, and Swiss franc.

Currency indices are designed to measure changes in the value of the currency. They do that by tracking the exchange rates of currencies that have the highest liquidity on the market. The U.S. Dollar index is the most popular and commonly traded currency index.

Simply put, if the USDX goes up, that means the U.S. dollar is gaining strength or value when compared to the other currencies. Similarly, if the index is currently 80, falling 20 from its initial value, that implies that it has depreciated 20%.

One poplar way to trade the dollar index is as a hedge against moves in the US dollar. If you're worried that a rising USD could negatively impact your stock portfolio, for example, you might buy the DXY to compensate. Then, any losses from your stocks might be counteracted by gains from your dollar index position.

If the demand for the dollar increases then so does its value. Conversely, if the demand decreases, so does the value. The demand for the dollar increases when international parties, such as foreign citizens, foreign central banks, or foreign financial institutions demand more dollars.

U.S. Dollar Index (DXY)