Language is indeed used to communicate with one another but when it comes to a professional setting, it changes into much more than that. In a business scenario, language becomes a tool for making the right statements and ensuring that everything is conveyed in the right manner without any misunderstanding or mistakes.
Compared to a casual friendly conversation, a lot more rides on a business communication. The use of language in an email or call could be the difference between a profitable deal and a missed opportunity.