Retail Forex market (retail currency trading or retail FX) is a part of the global Foreign exchange market. According to the New York Times the retail Forex is a risky market overcrowded with cheaters trying to swindle the assets of credulous individuals. There is an opinion that almost 90 percent of retail Forex traders always lose their money.
Spot is a transaction that is delivered in 2 days (the only exception is the Canadian dollar). Compare with the futures the delivery term of which is 3 months. The spot is a direct exchange between two currencies with usually no interests. Moreover the spot is the most used transaction according to the volume in the Forex transactions.