Where do I find the Standard ISO C++?

[gedamial]

Many times I read C++ documentation and they refer to the Standard ISO C++

Where can I get it for free?

Why do they sell it?

[Golden Lizard]

https://isocpp.org/std/the-standard

[Cubbi]

The best browseable copy now is http://eel.is/c++draft/

for pdfs and official revisions see http://en.cppreference.com/w/Cppreference:FAQ#Which_revision_of_the_C.2B.2B_Standard_does_this_reference_adhere_to.3F