
A quote of USD/EUR 0.7953 means that one U.S. dollar is equal to 0.7953 euros. When this currency quote goes up, it means the dollar has appreciated in value and the other currency has weakened. If the USD/EUR quote increases from 0.7953 to 0.8027, it indicates the dollar is stronger because it will now buy more euros than before.
For insight, see "Calculating Your Profits Correctly" on this blog.