The History records all changes made on a participant's record. This concerns all data fields such as name, contest, additional fields or status of the participant.
You can review all these changes in the Participants Window in the History tab, here you can see all of the changes which have been made to which field, and by which user or software tool. Additionally you can revert changes either individually or in bulk, by using the checkboxes.
In case there are a lot of changes in your Event File, the history might inflate the file. You can delete all History entries via the Delete Data function.
The history can also be downloaded as an excel for an individual participant or for all participants if you need to review bulk changes or as a backup before deletion.