We are dealing with money and when we send monies abroad we need to change its currencies from senders currency to recipients currency.

How does it works. Currencies have daily exchange rate it might be up or down. But how does trading gains. of course the difference is what we could profit/loss. If you send dollars at the value lower than recipients exchange rate then you loss some but others benefit the loss.

Forex trading is a one good profit generation but you have to learn the basics before you jump start.

I can suggest one at forex-metal. Browse, learn and get started.