调换 is a transitive verb meaning 'to exchange' or 'to swap'—it implies mutually replacing two things or people in position, role, or function. The first character 调 (diào) conveys the idea of adjusting or shifting (as in 调动 'to assign or transfer'), while 换 (huàn) means 'to change' or 'to replace'. Together, they emphasize a deliberate, often formal or practical, two-way substitution rather than a one-sided replacement.

This word is commonly used in everyday situations like swapping seats, rotating work shifts, exchanging classroom assignments, or changing roles in a team. It carries a neutral-to-formal register and is more common in spoken and written Mandarin than colloquial alternatives like 换 (huàn) alone. Unlike 置换 (zhìhuàn), which often refers to technical or official replacements (e.g., of equipment), 调换 suggests symmetry and reciprocity—both sides are actively involved in the switch.