Mae'r defnydd o gontractau dim oriau wedi cael sylw mawr ymhlith y cyhoedd, y byd gwleidyddol a'r cyfryngau yn y misoedd diwethaf. Mae contractau dim oriau wedi ennill eu plwyf mewn rhai sectorau a swyddi, ond mae eu defnydd wedi cynyddu'n sylweddol dros yr ychydig flynyddoedd diwethaf, ac mae pryderon mawr wedi bod ynghylch eu heffaith ar weithwyr a'r defnydd amhriodol a wneir ohonynt.
The use of zero-hours contracts has generated significant public, political and media interest in recent months. Zero-hours contracts are well-established in certain sectors and occupations but there has been a sustained increase in their use over the last few years, and significant concerns have been raised about their impact on workers and their inappropriate use.