Add FAQ about oneMKL

README.md

@@ -464,6 +464,21 @@ ninja -t clean
 
 ## FAQs
 
+### oneMKL
+
+1. What is the difference between the following oneMKL items?
+   - The [oneAPI Specification for oneMKL](https://spec.oneapi.com/versions/latest/index.html)
+   - The [oneAPI Math Kernel Library (oneMKL) Interfaces](https://github.com/oneapi-src/oneMKL) Project
+   - The [Intel(R) oneAPI Math Kernel Library (oneMKL)](https://software.intel.com/content/www/us/en/develop/tools/oneapi/components/onemkl.html) Product
+
+Answer:
+
+- The [oneAPI Specification for oneMKL](https://spec.oneapi.com/versions/latest/index.html) defines the DPC++ interfaces for performance math library functions. The oneMKL specification can evolve faster and more frequently than implementations of the specification.
+
+- The [oneAPI Math Kernel Library (oneMKL) Interfaces](https://github.com/oneapi-src/oneMKL) Project is an open source implementation of a subset of the specification. The project goal is to demonstrate how the DPC++ interfaces documented in the oneMKL specification can be implemented for any math library and work for any target hardware. We encourage the community to contribute to this project and help to extend support to multiple hardware targets and other math libraries.
+
+- The [Intel(R) oneAPI Math Kernel Library (oneMKL)](https://software.intel.com/content/www/us/en/develop/tools/oneapi/components/onemkl.html) product is the Intel product implementation of the specification (with DPC++ interfaces) as well as similar functionality with C and Fortran interfaces, and is provided as part of Intel® oneAPI Base Toolkit. It is highly optimized for Intel CPU and Intel GPU hardware.
+
 ### Conan
 
 1. I am behind a proxy. How can Conan download dependencies from external network?