同步 (tóng bù) literally combines 同 (‘same’ or ‘together’) and 步 (‘step’ or ‘pace’), conveying the idea of moving, operating, or occurring at the same time and in the same rhythm — like two dancers stepping in unison. It emphasizes precise temporal coordination and consistency between separate elements.

This word is widely used in technical contexts — especially computing, telecommunications, and engineering — to describe systems that maintain consistent timing or data states across devices or processes (e.g., syncing files across phones). It also appears in education, sports training, and even music instruction, where alignment of actions or outputs is essential. While it can occasionally function as a noun (e.g., 同步是关键 — ‘Synchronization is key’), its most frequent uses are adjectival (同步更新 — ‘synchronous update’) or adverbial (同步进行 — ‘to proceed simultaneously’).