school field trip; educational visit
Used for class outings to factories, museums, offices, etc., as part of school learning.
Next week, we're going to a car factory on a school field trip.
I'll hand out the field trip guidebook.
遠足 is a school excursion or outing, often recreational (e.g., to a park or mountain), while 社会見学 is specifically an educational visit to a workplace or institution.
修学旅行 is a longer school trip, usually overnight and to a distant destination, whereas 社会見学 is typically a shorter, local visit.
Compound of 社会 (society) and 見学 (observation/study visit). The term is a straightforward modern coinage for school-organized visits to learn about society and workplaces.