Spread is the Difference between the ask and bid price, you can say this is the difference that the broker is charging you since you are using his platform to trade. 

You can simply calculate spread by this Furmula > Bid price – Ask price = Spread

Spread is good for you as it is minimum because if you open a trade and the spread is high then you’re trading will cover the spread first then it will convert to profit, You can see our suggested broker list to get the lowest spread idea.