Commercial diplomacy is when countries work together to make sure their businesses, like companies and factories, can work together to make and sell products. It's kind of like a partnership between different countries. Every country has different laws about how businesses can work there, so it's important for countries to talk to each other and figure out how to make sure businesses can trade with each other. Most countries have diplomats who do this kind of work by talking to each other to figure out how to make sure businesses can trade. Commercial diplomacy helps countries build relationships with each other, which makes it easier to make money together.