What is a Microphone Preamp?

In this video, Mr. B ( @MrBintheStudio ) explains microphone preamplifiers, aka mic pre's, or preamps. Also a comparison between four mic preamps: the Neve 5024, the Avalon 2022, the C|24 mic preamps, and the Rolls MP13. Media Arts degree programs at Northeast Community College: https://neccweb.azureedge.net/documents/degrees-and-programs/programs/Media-Arts.pdf