What are Bid & Ask Spread?

All Forex quotes always include a two-way price -the bid and ask. The bid is always lower than the ask price. The bid is the price at which a Forex trader will sell, while the ask is the price at which the Forex trader will buy.

The spread is the difference between the bid and the ask price.

For example:
Taking on EUR/USD quote, the bid price is 1.8000 and the ask price is 1.8010. Using a online Forex trading platform, if the Forex trader clicks "Sell" button, he/she sell Euros at 1.8000. Likewise for buying, if the Forex trader clicks "Buy", he/she will buy Euros at 1.8010.