Arm Ltd., the architect of modern smartphones and some PCs, has entered the chip market with help from Meta. The company's first chip, the Arm AI CPU, will be designed for data centers and is likely to power Meta's AI efforts in the cloud. The move comes as Rene Haas, CEO of Arm, described it as a "defining moment" for the company. Over 50 ecosystem players endorsed Arm's decision, including chip suppliers Mediatek, Micron, Marvell, and ST Micro. However, major customers including Apple, Nvidia, and Qualcomm have not yet commented on the move.