Non-verbal communication such as facial expressions, eye contact, body language, and personal space play a significant role in how messages are interpreted. Facial expressions can convey six universal emotions and eye contact indicates levels of interest, while body orientation and gestures provide additional context to what is said. Paralinguistic features like tone of voice, pauses, and speech patterns also influence communication beyond the literal meaning of words. Active listening techniques like open-ended questions, reflection, and focusing on understanding the speaker can improve conversations.