Apple's M-series is the company's all-new chips for MacBooks and select iPads. The company started transitioning from Intel processors in late 2020 and finished the process in 2023 with the M2 Ultra Mac Pro. The number in M-series chips represents the generation of the SoC, while the Pro, Max, and Ultra refer to the scale and performance of the chip within that generation. Apple is currently in the M5 generation, with the latest chips introduced being the M5 Pro and M5 Max. The higher the number, the newer the generation, which means that the M1 chip was the first to come out.