Communicating within a company is or at least should be professional and formal. Even if the environment of the company is friendly and relaxed, some conversations are meant to be done as per the standard best practices. By being formal, we don’t mean that you should invite your colleagues or your CEO to your wedding in a formal way. What we mean here is that some things, such as reference letters, cover letters, thank you letters or any other forms of communication need to be done in a professional as well as formal manner.