A person is said to have domicile in a country in which he/she is considered to have his/her permanent home. A person cannot have more than one domicile. Domicile plays an important role in writing of Will, intestate succession and succession planning.
Domicile is the country in which a person is said to have his permanent residence.
For instance, if an Indian person moved to the USA temporarily on a H1B visa for employment purposes, his/her domicile would continue to be India, as the permanent residence of the person is still India.