OpenCL is the first Cross-Architecture, Cross-OS, open standard for parallel computing on heterogeneous systems. It targets GPU's, CPU's, and other processing devices (like DSP's and Accelerators), providing a uniform programming model of the system. OpenCL is designed to support a wide range of usages, from GPGPU GFX usages (like Physics) to High Performance Computing. This introduction will present OpenCL Programming Model (platform, memory, compilation, etc.) & the OpenCL C Language (an extension of ANSI C).