Body language is a nonverbal behavior. It tells us a lot about the current mental state of the person displaying it and can help us get a better idea of how the person is feeling. It is one of the most important ways our brains communicate with other people, which can either be positive or negative. It is an essential tool for building rapport, and is often used in presentations, interactions, and job interviews to let people know that you are listening, interested, and want to be able to connect. The body language of the people you are watching has a strong impact on their perceptions of you and it has a strong impact on their behavior towards you.