You have to know this quotes and see the market movement on charts in Forex to trade. It is also regularly significant (especially in day-trading) to see live info. The decisions are best made if a trader has adequate information. Furthermore, automated trading systems as an example Forex MegaDroid, wouldn’t be possible at all without these feeds. This data comes from special online servers where the currency prices are monitored from central banking institutions of the planet. This information is not free, but there are feeds that come for no charge, albeit they are delayed. That’s only a basic concept of how it works.