Amnesty International uses the term "rendition" to refer to a variety of practices by the US authorities involving transfers of individuals from one country to another, without any form of judicial or administrative process such as extradition. These practices, usually carried out in secret, include transferring "war on terror" detainees into the custody of other states, assuming custody of individuals from foreign authorities and abducting suspects on foreign soil.
Amnesty International believes that these practices are illegal because they bypass any judicial or administrative process such as extradition. Under international law, it is illegal to transfer people from one country to another without any kind of judicial or administrative process.