Presentation techniques for YouTube
In Russian we have term for them — плашка.

English name I personally don't like — Lower third

I was making them in After Effects. With animations, dynamic text, etc. There is a lot of tutorial (example), how you can make one. 
But I believe that without animations you can make them in a lot of other video editing apps. It is basically a type of Title (Premiere Pro). Or art with alpha channel in any software, which allow to compose picture on top of the video.

You can achieve similar result directly on YouTube with annotations. Similar to this answer. It will not look so good, but can contain text information.