In our daily lives, communication is prevalent. We don't just communicate because we want to; we need to. Often, we use words to understand each other. However, there are times when we observe people and try to comprehend their intentions. We rely on "body language". This reliance propagates the misleading idea that people communicate with their bodies just as they do with words. This is where misunderstandings frequently occur, sometimes even due to incorrect concepts propagated by so-called experts. The result is a loss of trust among readers or, worse, the disruption of interactions and relationships. Through a science-based approach, this work is primarily dedicated to all readers aged 18 and above who are passionate about communication and keen to understand others. Additionally, professionals from various sectors will find practical concepts and references for research, study, and daily work.