In Forex trading, the Open price of a new period is usually the same as the close price of the preceding one. If a new period opens at a price significantly different (higher or lower), this gives way to a Gap scenario. This suggests an imbalance in the price action. Price tends to move during the new period to cover the gap created. This move presents consistent buying and selling opportunities; hence potential to make profit.
There are two types of Gap scenarios
'Gap Up' - Open price...