1. What does it mean?
인강 abbreviates 인터넷 강의. It refers to lessons delivered online, often as recorded videos that students watch for school subjects, exams, or other skills. 인강을 듣다 means taking or watching such a lesson.
Also written or said as ingang
2. The nuance
Not all online lectures are recorded or self-paced. The abbreviation describes the delivery channel, whereas 현강 emphasizes attending the class in person.
3. Examples
“모르는 부분은 인강을 멈추고 다시 봤어.”
I paused the online lecture and replayed the part I didn't understand.
“이동 시간을 아끼려고 이번 수업은 인강으로 들어.”
I'm taking this class online to save commuting time.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.