I would like to know how to do a certain kind of effect with video. I would like to know what it's called and how to search it (so I can learn how to do it) and the best software to do it on. I'm trying to figure out how to do a thing where you display text on screen and then have the lines get revealed as a voice reads them out like this

> https://www.youtube.com/watch?v=eldmRlv3iUY

I tired asking on Reddit but my post has been waiting to be reviewed by a janny for several days now