Use the Fires dropdown list to define the trigger action time. It can be Before or After to indicate that the trigger activates before or after the statement that activated it.

The Trigger Event indicates the kind of statement that activates the trigger. It can be one of the following:

Insert
The trigger is activated whenever a new row is inserted into the table.

Update
The trigger is activated whenever a row is modified.

Delete
The trigger is activated whenever a row is deleted from the table.