I know about GCC and G++. GCC is for compiling C programs, and G++ is for compiling C++ programs, both created and are part of GNU. But I have three misunderstandings. 1, I don't know what is the difference between clang-llvm and clang. 2, I have heard about GPP as well, and I am confused about the difference between G++ and GPP, please explain to me like I'm a child. 3, I know a few compilers: the first one is GCC, the second is Clang, and the third is MSVC. Now here is when the confusion kindles, I heard that apple have created their own compiler, and if I wanted to install GCC and G++, I don't know how to install it, if I install command line tools, I am sure it will install Apple's compilers, but the things is that GCC and G++ are not made by Apple.