Trading means buying and selling. Gambling is the prediction of games or matches.

In Forex, although you will predict but you buy and sell. Traders will want to buy at lower price and sell at higher price. Or when the know the market is going down, they open a long position. When they also predict the market is going up, they buy. That is not the same as gambling.

But some people call trading as gambling because of the risks. Trading is as risky as gambling. But how you use them to make money is different. Gambling do not requires indicators and technical analysesx but trading does. But just know that they are both risky.