How to render with transparent or no background?

I want to save my renders with no background at all - transparent. In the render window I can toggle the background on and off, but it won’t save the render with the background turned off. Is there some way to achieve this? I have tried changing the environment and background colors, but it does not do what I want. Any way to do this? TIA!

If you save the render as a .PNG image, the transparency (alpha) channel will be included in the saved file.

Ah! :blush:
Thanks very much. I was saving as TIF.