RISC and CISC are two language which your CPU speaks, and which have different strengths and weaknesses. Reduced Instruction Set Computer vs. Complex Instruction Set Computer. It's something like Chinese vs. English. Either have a word for everything but that means there is a lot of words to learn, or have a smaller amount of words but that means you need more words to describe what you mean.

Highly technical; both been around for a while, and iirc usually CPUs use CISC, but RISC always retained it's strengths, so scientists are always looking into the difference in application for both.

Ngl I have no clue why this technology is so newsworthy rn but I know Western countries made a fuss about China activitely pushing the lesser used RISC architecture.