Just realized a lot of people in the community don't actually understand what is PnL, so let me break this down in a way that makes sense.

PnL stands for Profit and Loss, and honestly it's one of those terms you need to get right if you're serious about trading or investing. Basically, it's measuring how much money you've made or lost over a certain period. Sounds simple, but there's actually more to it than people think.

Here's the thing about what is PnL in practice: there are two completely different scenarios you need to understand. The first one is Realized PnL, which is your actual profit or loss from trades you've already closed. That's locked in. You sold, you got your money, done. But then there's Unrealized PnL, which most people get confused about. That's the gain or loss on positions you're still holding. It looks good on paper, but it can swing wildly depending on where the market goes next. That's why some people call it Paper PnL.

If you want the math behind what is PnL, it's pretty straightforward: take your total revenue and subtract your total costs. In trading specifically, you're looking at (Selling Price minus Purchase Price) times the Quantity, then you subtract your fees. That's your PnL.

Let me give you a real example. Say you grabbed 1 BTC at $40,000 and managed to sell it at $45,000. Your PnL would be (45,000 minus 40,000) times 1, which gives you $5,000 profit. Sounds easy when it works out like that, right?

Why does understanding what is PnL actually matter? Because it tells you whether your strategy is working or not. It informs every decision you make going forward. It's essential for tax reporting too, which most traders hate dealing with but it's necessary. Whether you're day trading, swing trading, or just holding long-term, tracking your PnL is non-negotiable if you want to improve.

I've seen traders obsess over every tick but never actually calculate their real PnL at the end of the month. That's backwards. If you're serious about this, start tracking what is PnL for your portfolio right now. You can use Excel, Gate's built-in tools, or whatever works for you. Just make it a habit.