The Western European prostitution market has become increasingly globalized during the past 15 years. The processes by which Eastern European, Southeast Asian, Latin American, and Sub-Saharan African women end up as sex workers in Western Europe are highly varied. The largest group of prostitutes from Sub-Saharan Africa comes from Nigeria, and they are usually recruited through a specific type of trafficking network. The term "trafficking in persons" is restricted to instances where people are deceived, threatened, or coerced into situations of exploitation, including prostitution. This contrasts with "human smuggling," in which a migrant purchases services to circumvent immigration restrictions, but is not necessarily a victim of deception or exploitation.