I designed an introductory PowerPoint for my first year ECE students. This PowerPoint discussed what they would expect in their online placement. Using Screencast-O-Matic, I was able to record a video for the students to watch. I find this application very easy to use, and I have also used it in the past for asynchronous recordings of class session material.
Link to video clip: https://screencast-o-matic.com/watch/crhQceVfjLC