Indefinite Leave to Remain (ILR) is a type of immigration status in the United Kingdom that allows a person to live and work in the country without any time restrictions. It is often granted to individuals who have lived in the UK for a certain period, usually after holding a valid visa. Once someone receives ILR, they can access public services and benefits, and they are not required to renew their immigration status. However, they must still follow certain rules, such as not spending extended periods outside the UK, to maintain their ILR status.