ARM stands for Advanced Risc Machines. ARM is a company based in Cambridge, UK. http://www.arm.com ARM's traditional products are CPU cores, referred to as ARM cores. These CPU cores can be and are licensed by many major silicon vendors and used in Tablets, phones and a lot of other equipment.
There are a number of competitors to ARM. Most importantly RISC-V, an open CPU core design is emerging as main competitor. This is so especially in countries like China, striving to be independent from ARM's technology. One event that fueled this desire is that ARM cut ties with Huawei without head warning after US ban, citing that its chip designs include “US origin technology". ARM is complying with the latest restrictions set forth by the US government and is having ongoing conversations with the appropriate US government agencies to ensure we remain compliant