Rūpa — Form — one of the five aggregates (स्कन्ध Skandhas) in Buddhism, refers to the physical form or material aspect of existence. It encompasses everything that is tangible and can be experienced through the senses, including the body and external objects. Rūpa is characterized by its impermanence, constantly undergoing change and decay. Understanding Rūpa helps in recognizing the transient nature of physical existence, which is essential for developing detachment and progressing towards enlightenment.