Is The employer is required to give applicants a reason why they aren't hired?

In most cases, employers are not legally required to provide applicants with a reason for their non-selection. However, some jurisdictions may have specific regulations, especially for certain positions or when discrimination is suspected. Providing feedback can be a good practice for employers, as it helps maintain a positive reputation and can assist applicants in their job search. Ultimately, the decision to provide feedback is often left to the employer's discretion.