A wave is a common hand gesture used to greet or acknowledge someone. It typically involves raising one hand and moving it side to side, signaling friendliness or recognition. Waving can be done with one hand or both, and the movement can vary in intensity and duration depending on the context. Waving is often used in social situations, such as when meeting friends or saying goodbye. It can also serve as a non-verbal way to attract attention or express excitement. This gesture is recognized across many cultures, making it a universal form of communication.