This is a screen cast where the teacher has created a simple mini grammar lesson. The teacher has noticed there are problems with a certain grammar rule and simply written out some examples in Microsoft Word and then used a screen cast technology to record themselves going over the rule. It is very quick to make and requires minimum technological skills. The teacher can send the video to the students or put it on a blog, wiki or on the virtual learning environment of the school or institution.
The teacher simply marks out the area of the screen and clicks a button. Whatever is under the marked area will be recorded as a video along with the voice. It makes no difference to the screen cast tool what is on the screen. It simply records the area that has been marked out. This particular example was used using SnagIt. There are also other solutions such as ScreenR and JING.