All ARM processors are considered RISC designs, but this doesn't mean much because RISC itself is simply an approach to design rather than a technological standard or processor architecture. The term originally came into use back in the 1980s with a research project called Berkeley RISC that investigated the possibilities of this approach to design and then created processors based on it. It stems from a belief that a processor with a relatively simple instruction set will be more efficient than one which is more complex.
RISC is, in its broadest form, a design philosophy for processors. It's thrown around left and right, often as a point of differentiation from laptops and desktops, which use Intel x86. If you've paid any attention to smartphones and tablets you've likely heard of the term " ARM " used to refer to the hardware inside. It also designs cores that implement this instruction set and licenses these designs to a number of companies that incorporate those core designs into their own products.
British company ARM Holdings develops the architecture and licenses it to other companies, who design their own products that implement one of those architectures- including systems-on-chips (SoC) that incorporate memory, interfaces, radios, etc. ARM, originally Acorn RISC Machine, later Advanced RISC Machine, is a family of Reduced Instruction Set Computing (RISC) architectures for computer processors, configured for various environments.
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