交互 (jiāohù) is used in technical/system contexts to mean 'interactive' or 'mutual exchange' — for example, in computing, data exchange, or system interaction. As an adverb it overlaps with 互相/相互 ('each other'), but those are for general reciprocity; as a verb it is distinct from 互动, which describes interpersonal or social interaction. 双向 is a related adjective for 'two-way'.