Those security features were introduced in order to render passports and travel documents more secure and to establish a reliable link between the holder and the passport or travel document.
Tugadh isteach na gnéithe slándála sin chun pasanna agus doiciméid taistil a dhéanamh níos sláine agus chun nasc iontaofa a dhéanamh idir an sealbhóir agus an pas nó an doiciméad taistil.