When User Record Auditing is not enabled, the Modification History table displays each time the User Record page is edited for a user. This includes the name and username of the user who modified the page and the date and time at which it was edited. However, the Modification History table does not display details for each field that was modified. This makes it difficult to audit which fields have been modified and the field's previous value.
When User Record Auditing is enabled, the Modification History table displays a detailed record of each successfully completed and scheduled modification to the User Record page for a user. In addition, administrators can search modifications by field name and filter modifications by field type.
Note: Administrators can only search modifications when using the old User Record page.
See User Record - Modification History.
Not all fields on the User Record are audited. See User Record - Audited Fields.