What was 70mm photography?

Following up on this question, I’ve become intrigued by 70mm photography. It’s a format I hear about often in filmmaking, but I wasn’t aware that it was used for photos as well.

According to this 20 year old webpage, exposed areas were similar to medium format?

Until I can get my hands on a decent camera to try it by myself, I’ve only been able to gather very little info about this format online, and would like to see lists of cameras made for this format, what the cartridges looked like, what the photos looked like, etc.