“Screencast” usually means a narrated recording of what happens on screen. In Chrome you can screencast a tab, a window, or the full display with Screen Recorder – Video & Webcam.
Quick screencast
- Choose the source that matches the story (tab for one site, screen for multi-app).
- Turn on the microphone.
- Optional: add a webcam bubble.
- Record, stop, trim and download.
Keep files short. One topic per screencast is easier to send than a long unbroken take.