The C++14 standard is often referred to as a bugfix for C++11. It contains only a limited list of changes of which most are extensions to the new features in C++11. Below you can find an overview of the changes as they have been grouped on the isocpp FAQ with links to more detailed documentation.
constexpr
[[deprecated]]
attributestd::
typesstd::make_unique
_t
aliasesget<string>(t)
)greater<>(x)
)std::quoted
std::gets
was deprecated in C++11 and removed from C++14std::random_shuffle
is deprecated