Gaps are points in a market when there is a sharp movement up or down with little or no trading in between, resulting in a ‘gap’ in the normal price pattern. Gaps do occur in the forex market, but they are significantly less common than in other markets because it is traded 24 hours a day, five days a week.
However, gapping can occur when economic data is released that comes as a surprise to markets, or when trading resumes after the weekend or a holiday. Although the forex market is closed to speculative trading over the weekend, the market is still open to central banks and related organisations. So, it is possible that the opening price on a Sunday evening will be different from the closing price on the previous Friday night – resulting in a gap.