# Screencast Abstract, virtual and interfaces The video's below explain the **abstract & virtual keywords **and **interfaces**. Note that the screencasts have **no sound**. For **enhanced navigation possibilities** through the video, please open the embedded video's below in Panopto by clicking the ![watch in panopto (icon)](https://leho-howest.instructure.com/courses/12413/files/1868589/download?wrap=1) icon. ## Screencast 1: Abstract vs virtual <iframe src="https://howest.cloud.panopto.eu/Panopto/Pages/Embed.aspx?id=25db328c-4239-47e8-8d64-af2901339066&autoplay=false&offerviewer=true&showtitle=true&showbrand=true&captions=false&interactivity=all" height="405" width="720" style="border: 1px solid #464646;" allowfullscreen allow="autoplay"></iframe> ## Screencast 2: Interfaces <iframe src="https://howest.cloud.panopto.eu/Panopto/Pages/Embed.aspx?id=4e171efa-3651-43b6-97ab-af290133a177&autoplay=false&offerviewer=true&showtitle=true&showbrand=true&captions=false&interactivity=all" height="405" width="720" style="border: 1px solid #464646;" allowfullscreen allow="autoplay"></iframe>