Temporary Files: Can They Be Saved/Accessed Again?

Hi all chipologists

watching a video on Youtube or similar sites, takes a while to load(buffering). Once this is complete, the video can be played again uninterrupted. However, close the connection to the site and it's gone.

Suppose the video files are stored somewhere on my computer in a temporary file? How can I save/ access the video later ( if youtube or similar site does not provide for a 'download'link)?

by rightclicking the video or thumbnail i do not get an option to 'save target ', however, i must have downloaded somehow, in order to be able to view. Am I on the right track here?

Please shed some light on this for the not-so-clued-up computer users.

Thanks