What YouTube feature is helpful for students who are not proficient in English?

Captioning and subtitles are particularly beneficial for students who are not proficient in English because they provide a written transcript of the dialogue being spoken in videos. This allows viewers to read along while listening, which can enhance their understanding of the content. It also helps students link written and spoken language, aiding in vocabulary development and comprehension.

While slowed playback can help with processing information, it does not directly address language comprehension. Annotations allow creators to add notes or additional information but do not support language learning directly. Live chat may facilitate interaction but does not serve the same educational purpose as captioning and subtitles. Therefore, captioning and subtitles are uniquely suited to aid non-English speakers in grasping video content more effectively.