What is the cross exchange rate?

Excuse me, could you please elaborate on what exactly is meant by the term "cross exchange rate"? As I understand, it's related to the exchange of one currency for another, but I'm curious about how it specifically differs from a direct exchange rate and how it might impact international trade and financial transactions. Could you provide a clear and concise explanation, possibly with an example to illustrate the concept? Thank you in advance for your clarification.