What are the .dat files? And what’s the difference between a blk00000 and a rev00000?

I’m studying about the blockchain and I just downloaded it. I have 816 .dat files and for every file named as blk#.dat (where # is a five digits number) I have a rev#.dat file, What does it mean?? How can I work with them if I need to visualize them on Gephi??

Thank you so much!!Preciated!!

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