What are subtitles, how do you make them, and how do they work/In their basic form?
Subtitles are textual content that appears on the screen as a video plays, usually at the bottom of the screen. They allow the viewer to read what’s said within the audio track. Subtitles may either be in the same language as in the original audio, or they can be translated into a totally different language so as to address an even larger audience.

Research Done By Everline Moragwa Achira
https://dubbingking.com/use-of-multilingual-subtitles-in-audio-visual-translation/