Revenue is the total amount of money a company earns from its primary business activities โ before subtracting any expenses.
If you run a lemonade stand and sell 100 cups at โน10 each, your revenue is โน1,000. It doesn't matter how much you spent on lemons, sugar, or cups โ that's not relevant yet. Revenue is just the raw income.
In financial statements, revenue is also called: โข Sales โข Net sales โข Top line (because it appears at the top of the income statement) โข Turnover (common in UK/India)