It’s a co-op. Lazy folks like me drop the hyphen, then have to explain it later.
I think it’s similar to an intern, but co-ops are paid placements for students still in school. I dunno if that’s what you call an intern.
UWaterloo’s degrees often have a co-op element. They do 4 months school, 4 months paid work (co-op) year round, for 5 years. That lands them a 4 year degree with 2 years experience. Actsci students there do this commonly. (our co-op is from UWaterloo, but not actsci).
It’s a cool way to do it, you end up in school some summers. Sounds bad, but summer on campus is the best time of the year.