The word 需求 is formed by combining two characters, each contributing a core meaning to create a new, unified concept. The first character, 需 (xū), conveys the idea of "need" or "necessity". The second character, 求 (qiú), adds the notion of "seeking" or "asking for". When joined, they conceptually blend to express the idea of something that is both necessary and actively sought after, forming the complete meaning of "demand" or "requirement".