What does international trade do? What is the profit model of the company?

As far as I know, let me give you an example. An international trading company can buy goods from a factory, perhaps at a lower price (usually the factory and the trading company are in the same country), and then the company sells these goods to foreign companies. If the selling price is higher than that bought from the factory, there will be a price difference, and the company's profits will be obtained from this price difference.