The ILR Visa UK is a visa type of U.K., which allows a person (non resident of the U.K.) to live there without any kind of the restrictions. Basically, the I.L.R. is known to be indefinite leave to remain in the U.K. without any kind of the restriction or interference from the authorities.
Read more:- https://www.visasimple.com/ilr-visa-uk.html

All you need to know about the ILR Visa UK (1).pdf