Breakout happens in forex when prices moves above a resistance levels or when prices moves below a support levels. There is one great factor that can push price above a resistance or below a support level and that is the news. Normally technical factors only do not push the market this far. When breakout happens, not all traders would understand since not all the traders use the same support or resistance levels. Breakouts provides strong trading opportunities. As pointed out early, when a news triggers it, the impact is high the results goes a long way, when the volume is low, it will liked crawl back to where it was.