The character 本 (běn) taps into a deep cultural value in China: the importance of understanding the origin or root cause of things (追本溯源 - zhuī běn sù yuán). This is evident in traditional Chinese medicine, which seeks to treat the root imbalance causing an illness, not just the symptoms. It's also present in philosophy and strategy, where understanding the fundamental principles of a situation is paramount to success. A useful comparison is the English phrase “getting to the root of the problem.” While this is a common expression in the West, the concept is physically and constantly reinforced in Chinese through the character 本. It's not just a metaphor; it's a building block of the language itself. This gives concepts like “foundation” (基本 jīběn) or “essence” a tangible, visual anchor that is subtly different from the more abstract Western approach. Furthermore, the name for Japan, 日本 (Rìběn), means “sun's origin.” This name, given from a Chinese perspective, reflects Japan's geographical location to the east, where the sun appears to rise. It's a powerful example of how 本 is used to define a place based on its fundamental relationship to the natural world.
本 (běn) is an incredibly versatile character used in many different ways.
Its formality changes with context. As a measure word, it's neutral. As the pronoun “this,” it is distinctly formal.