从这篇文章介绍了什么是CUDA：
CUDA® is a parallel computing platform and programming model invented by NVIDIA. It enables dramatic increases in computing performance by harnessing the power of the graphics processing unit (GPU).
CUDA是NVIDIA提供的一个并行计算平台和模型，可以让程序更好地利用GPU。下面这段话则很好地解释了什么是“GPU computing”：
Using high-level languages, GPU-accelerated applications run the sequential part of their workload on the CPU – which is optimized for single-threaded performance – while accelerating parallel processing on the GPU. This is called “GPU computing.”