If you don't know what you're doing in trading that's the time you can say it's gambling. Trading can be a source of income if you know what you're doing. Trading with a plan and profitable strategy makes you increase the probability of winning. We all know that there's no strat with100% win rate but base on our backtest the strategy is working. So if you always follow your trading plan in trading, and depending on the luck, you're not gambling.