While “反馈” is a modern-sounding, almost technical term, the act of giving it is deeply rooted in Chinese cultural norms. In many Western cultures, especially in business, direct and “radically candid” feedback is often encouraged as the most efficient path to improvement. In China, however, the concepts of 面子 (miànzi - face, social dignity) and 和谐 (héxié - harmony) can influence how feedback is delivered.
So, while you will constantly encounter the word `反馈` in modern China, remember that the act of giving it, especially when critical, requires a high degree of social awareness.
`反馈` is an extremely common and practical word. It's used as both a noun (“the feedback”) and a verb (“to feedback”).