What is a loop file?

[turbine]

I'm curious about this. I've been in the software development business for a long time but have never heard of this terminology.

[windos_no_thanks]

In this context it probably means something that exists as a file in one filesystem
but contains another filesystem. The compressed KNOPPIX file on the knoppix
CD is an example of such a file.

[turbine]

Thank you, windos_no_thanks, now I understand.