a friendly tour guide gestures while speaking to a group of international visitors using hand movements and facial expressions. Each traveler responds in their own way, some nodding, others pointing at maps, creating a lively exchange. The guide switches between different speaking styles and gestures to communicate with each person. Some travelers use translation apps on phones while others draw simple pictures to share ideas. Other passengers nearby engage in similar multilingual conversations throughout the busy terminal. a system of communication used by humans consisting of structured and conventional words and sounds