pedal steel guitars and resonator guitars

I was watching some song being played on RFD-TV. One guy was playing a stringed instrument which I wasn't familiar with (at least by sight; I was familiar with the sound from other songs), so I looked up what it is called: pedal steel guitar.

The next video shows how it works. It sounds very complicated to me, but I love the twangy sound.

"Steve Fishell explains how pedal steel guitar works" (Watch on YouTube)

Video title: Steve Fishell explains how pedal steel guitar works
Posted by: Guitarist
URL: https://www.youtube.com/watch?v=NrbSL92Kz1Y

"Owen Houlston - Slide Resonator Guitar" (Watch on YouTube)

Video title: Owen Houlston - Slide Resonator Guitar
Posted by: guitarjed
URL: https://www.youtube.com/watch?v=iJ1UXIppXyo

"Ghost Riders in the Sky - steel guitar" (Watch on YouTube)

Video title: Ghost Riders in the Sky - steel guitar
Posted by: Doug Beaumier
URL: https://www.youtube.com/watch?v=cK5aT07gOis

"Swamp Dog Blues / 1930s Broman Resonator Guitar /" (Watch on YouTube)

Video title: Swamp Dog Blues / 1930s Broman Resonator Guitar /
Posted by: JVStratocasters
URL: https://www.youtube.com/watch?v=mdx42zDniTo