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What is the reason why OPT is affiliated with the school when it expires?

Opt is an off-campus work permit.

OPT is the abbreviation of OptionalPracticalTraining, and it is the off-campus work permit granted to F- 1 students by the US Immigration Bureau. It is a temporary work permit for foreign students to apply their professional knowledge to off-campus practice. OPT's application was first approved by the school, then approved by the US Department of Homeland Security, and finally obtained OPT qualification.