What is Gapping in Spread Betting?

In financial spread betting http://www.financial-spread-betting.com/, if a market gaps through a stop level, you will be filled at the next best price after your stop was triggered. A gap is a break between prices that occurs when the price of a contract makes a sharp move up or down with no trading occurring in between and usually happens when a share or index opens the trading session significantly higher or lower than the previous day's closing price.