What is the dishonourment fee?

Could you please elaborate on what the dishonourment fee entails? Is it a penalty imposed in cases of default or a fee associated with a specific type of transaction? What are the circumstances that trigger this fee, and how does it differ from other fees that may be charged? Additionally, is there a standard amount for this fee, or does it vary depending on the situation or service provider? Understanding the specifics of this fee is crucial for making informed financial decisions.