Thousands of undocumented migrants are to be given the chance to officially reside in Ireland.
Justice Minister Helen McEntee has described it as a "once in a generation scheme".
It's estimated there could be up to 17,000 undocumented migrants, including 3,000 children, currently living here.
This scheme will give them the chance to officially reside here, access to employment and begin the path to citizenship.
Successful applicants will need to have been here for 4 years without immigration permission, or 3 years if they have children. They can include a spouse, partner and children aged between 18 and 23.
Applicants will need to meet standards regarding good character and criminal record checks will be done but minor convictions won't disqualify people.
The scheme opens for applications at 10 am this morning and will close at the end of July.
