CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

What is STP (Straight-Through Processing)?

Straight-through processing is a method of processing Forex trades which routes them straight through a broker’s servers and on to liquidity providers without having to be re-entered, and without intervention from a dealing desk. Straight-through processing shortens trade execution time and ensures that traders receive a better price. It also reduces slippage and re-quotes.