If we aren’t open and honest, we won’t gain trust. People will also be confused as to what we mean and won’t share important information with us.
Openness also means being open to new ideas, other points of view, and learning about different cultures, religions, personalities, and races, etc. The more open we are, the more we understand each other and thus better communicate..
Lastly, openness also means being available. If we are never around or always too busy, we will miss the opportunity to give and receive communication. We may think you are saving time. We are not. Failures in communication waste enormous amounts of time.