Body language is important at the workplace as 60-90% of communication is nonverbal. Good body language like making eye contact, an open posture, and a firm handshake convey confidence, while bad body language such as avoiding eye contact, fidgeting, and crossed arms can undermine your message and appear unprofessional. Mastering proper body language techniques can give you an advantage in interactions like interviews by positively influencing how others perceive you within seconds.