study tour; training trip
A trip organized for educational or professional development purposes, often by schools or companies.
Next month I'm going to Kyoto on a company training trip.
We visited museums abroad on a university study tour.
修学旅行 is a school trip for students, typically in elementary or secondary education, while 研修旅行 is for adults or professionals for training purposes.
視察旅行 emphasizes inspection or observation, often by officials or experts, whereas 研修旅行 focuses on learning and skill development.
Compound of 研修 (training, study) and 旅行 (travel).