The first NDA for an interview that I recall was from a big tech company, and most of it could be paraphrased as something like "Everything we tell you is under strict NDA; anything you tell us, we will treat as public domain" (or maybe it was more like nonexclusive license to use; I forget for certain which that particular company said, since I've also seen the latter since).

Later, I think that company reworked it to be more like "Don't tell us anything that could be proprietary to someone else!"

One company asked me to sign an NDA, they're a well known public but non-FAANG Boston based company. I didn't have a problem signing it but I also don't really see the point.

I've certainly never had to sign one.