Cherubim and Seraphim | Angels in the Bible | Book of Revelation

What is the difference between cherubim and seraphim in the Bible? Four living creatures are mentioned in Revelation 4 and 5. Are these cherubim or seraphim? What are their different characteristics and roles of these heavenly creatures or class of angels?

An excerpt from the Book of Revelation, Chapter 4: Four and Twenty Elders - https://www.youtube.com/watch?v=M9XF1JS-x2I

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