An Indefinite Leave to remain also called a UK Settlement Visa is a
document that shows that its hold has been granted immigration
status after a certain period under a provisional visa in the
United Kingdom and has shown a commitment to the UK. The status of
immigration is only given to people without the right to residency
in the UK. Read more :
https://www.visaandmigration.com/service/indefinite-leave-to-remain-(ilr)/24.html