What is HFR (high frame rate) format?

What is HFR (high frame rate) format?

This article discusses the HFR technology, including FPS and screen refresh rate, Cinerama and Todd-AO formats, Pro-Mist filter, soap opera effect, Showscan and IMAX HD, Motion Blur, features and prospects of 120fps, etc. The video shows playback of 25fps vs 50fps.