Non-verbal communication includes body language, facial expressions, gestures, eye contact, posture, appearance, use of space and time, silence, and paralanguage. Pictures, diagrams, graphs, charts, maps, and signs are also important non-verbal aspects of written communication. Body language conveys emotions and can dominate interactions, though it is sometimes unintentional. Factors like clothing, health, energy levels, and punctuality also influence non-verbal communication impressions. Maintaining appropriate eye contact and body posture can make interactions more effective.