The forex market is a very volatile market. When the market is volatile, traders get lessons on how to hedge, develop and acquire broad/diverse portfolios, and act on low leverage to exploit the prevailing market condition. There are two different types of volatility. They are historical and implied volatility. The former refers to the normal price action with respect to a period of time (say, a month or year). Abnormal current and future price action is referred to as implied volatility. It often exceeds the historical range when compared with the historical price action.
Binary option trading on margin involves high risk, and is not suitable for all investors. As a leveraged product losses are able to exceed initial deposits and capital is at risk. Before deciding to trade binary options or any other financial instrument you should carefully consider your investment objectives, level of experience, and risk appetite.
If traders are positive on the prospects for the Yen, they would expect the number on the right to go down – i.e. the Yen would be getting stronger against the Dollar. Traders would be buying less Yen with a Dollar as the Yen got stronger. Similarly, if the Yen was expected to weaken, forex traders would expect the Yen number to go up, reflecting the fact that the dollar could buy more yen.