An audit trail is like a digital paper trail that keeps track of every action and change made within an application. It's like having a detailed log of everything that happens, enabling you to trace back and see who did what, when, and why. This is crucial for security, compliance, and troubleshooting purposes.
For example, let's say you have an e-commerce website. The audit trail would keep a record of every customer order, every change made to the application, and every login attempt. If a customer reports an issue with their order, you can use the audit trail to see exactly what happened and if the application was changed.