Business communication is how people talk and send messages to each other when they're trying to work together to make something happen. Just like how you and your friends talk to each other to plan a game or a pretend tea party, people in businesses talk to each other to plan how to make money or create new products.
When people talk in business, they have to be very clear and specific about what they mean because misunderstandings can cost a lot of time and money. They might use fancy words like "budget," which means how much money they can spend on something, or "deadline," which is when something needs to be done by. They might also use special abbreviations, like "ASAP," which means "as soon as possible" or "FYI," which means "for your information."
Sometimes, people in businesses write down what they mean in messages to each other. They might send an email or a letter, which is like passing a note in class, or they might use something called a memo, which is a kind of report or summary of important information.
In business communication, people also have to act professionally, which means they have to be polite and respectful to each other. This means saying "please" and "thank you" and not using rude or mean language.
Overall, business communication is just like talking and passing notes with your friends, but it's more serious and important because it helps people work together to create things, make money, and build a strong company.