What exactly is the profit and loss of a portfolio?

In investment banking, PnL Explained (also called P&L Explain, P&L Attribution or Profit and Loss Explained) is an income statement with commentary that attributes or explains the daily fluctuation in the value of a portfolio of trades to the root causes of the changes.

What is the difference between P L Open and P L Day?

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Quote: Well they're very simply just trading terms and p l day means your profit and loss for the day. And p l open means your profit and loss. Since you opened the position.