Tandem is a term often used to describe two things working together in harmony. For example, in cycling, a tandem bicycle allows two riders to pedal together, sharing the effort and enjoying the ride. This concept can also apply to language learning, where two people practice speaking a language with each other, helping each other improve. In a broader sense, tandem can refer to any situation where two elements complement each other. In business, for instance, a partnership can be seen as a tandem relationship, where two companies collaborate to achieve common goals, leveraging each other's strengths for greater success.