I just noticed that many new traders don't really understand what PnL in trading is, and that leads them straight to failure. So let me explain this clearly.

PnL is basically your profit and loss in numbers. It sounds simple, but that's where most people fail. It's not just knowing if you made or lost money on a trade, but understanding the full pattern of your performance.

What happens to me when I see inexperienced traders is that they trade without measuring anything. They open positions, close positions, and don't even know if they are making or losing real money. That’s not trading, that’s gambling blindly.

The key is this: controlling your PnL is what allows you to see if your strategy works or not. If you don’t know where you stand in terms of gains and losses, how do you adjust? How do you improve? It’s impossible.

And here’s the important part. It’s not about winning every trade. That’s a myth. What matters is that in the long run, your profits outweigh your losses. A professional trader can have a 50% losing trade rate and still be profitable because they manage risk well.

Amateur traders see PnL as something secondary. Professionals see it as their compass. It’s the difference between trading with discipline and just hoping for luck. If you really want to understand what PnL in trading is and apply it properly, start recording every move, analyze your patterns, and adjust. That’s what separates those who last from those who disappear from the market.