Audit logs keep detailed records of key events in the system, and are designed so you can easily find what you are looking for when you need to know all the details about an event or series of events.
All logs are classified in 14 different categories, and each one keeps different parameters about the events it stores. By default, all logs will be showing the parameters that are considered most commonly used, but you can customize to show additional parameters when available and hide the ones you might not be interested in at that moment.
The email log search is the only one that has no selectable columns, but instead has several search fields to make it easier to find exactly what you need.
Let's explore what each of these categories can show us, as well as which column each one has enabled by default, and which ones we need to enable if we need...