An immigrant who files for asylum from outside the U.S. is a refugee. Usually, a refugee applies for asylum outside the U.S. in a refugee camp. A refugee can apply for asylum due to a well-founded fear of persecution in his/her home country. The cause of this fear must be based on political opinion, religious belief, nationality, race, or membership in a particular social group. Usually, the process for refugees is quicker than asylees. This is because they do not have to prove their status as a refugee since it is already determined while outside the U.S.