Intel oneAPI is a comprehensive, open development platform built for heterogeneous and accelerated computing. It allows developers to target CPUs, GPUs, and specialized accelerators using a single, consistent programming approach. With optimized libraries like oneDNN and oneMKL, oneAPI enhances AI inference, machine learning, and high-performance computing workflows. The platform supports modern programming models such as SYCL, OpenMP, OpenMPI, and Data Parallel C++ to enable scalable hybrid parallelism. Developers can migrate existing CUDA-based applications more easily using compatibility and auto-migration tools. oneAPI delivers performance and productivity across client devices, enterprise servers, and cloud environments. Its tools help analyze workloads, optimize GPU offloading, and improve memory efficiency. By leveraging open specifications, oneAPI promotes cross-vendor collaboration and long-term portability. The ecosystem includes extensive documentation, training, and community support. oneAPI is designed to meet the demands of modern applications that combine AI and advanced computation.