Are settlement and immigration the same thing?

Informal terms for settlement and immigration.

Settle: To live in a place (foreign country) for a long time. Your identity may be: permanent resident, to be applied for permanent resident (such as Lai Changxing); May also have joined the nationality of other countries; You may also work there for a long time.

Immigration: The general concept refers to people with permanent resident status, including those who have joined other countries' nationality (change of identity, called citizens).