AIO runtimes, also known as All-In-One runtimes, refer to a type of software framework that enables developers to build and deploy applications that can run on multiple platforms, including CPUs, GPUs, FPGAs, and other specialized hardware accelerators. The primary goal of AIO runtimes is to provide a unified programming model that abstracts away the complexities of different hardware architectures, allowing developers to focus on writing efficient and scalable code.