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A programming language created by Chris Lattner, creator of LLVM and Swift. Mojo uses the MLIR infrastructure of LLVM.

I don't know why providing basic context is so hard for some submitters here.

The site could also do a much better job. If doesn't mention what Mojo is it all on the linked page.

It is a closed source programming language, yes.

Compiled using electricity from coal power, yes.