C++20 includes the following new language features:

coroutines
concepts
designated initializers
template syntax for lambdas
range-based for loop with initializer
likely and unlikely attributes
deprecate implicit capture of this
class types in non-type template parameters
constexpr virtual functions
explicit(bool)
immediate functions
using enum
lambda capture of parameter pack
char8_t

C++20 includes the following new library features:

concepts library
synchronized buffered outputstream
std::span
bit operations
math constants
std::is_constant_evaluated
std::make_shared supports arrays
starts_with and ends_with on strings
check if associative container has element
std::bit_cast
std::midpoint
std::to_array

C++17 includes the following new language features:

template argument deduction for class templates
declaring non-type template parameters with auto
folding expressions
new rules for auto deduction from braced-init-list
constexpr lambda
lambda capture this by value
inline variables
nested namespaces
structured bindings
selection statements with initializer
constexpr if
utf-8 character literals
direct-list-initialization of enums
fallthrough, nodiscard, maybe_unused attributes

C++17 includes the following new library features:

std::variant
std::optional
std::any
std::string_view
std::invoke
std::apply
std::filesystem
std::byte
splicing for maps and sets
parallel algorithms

C++14 includes the following new language features:

binary literals
generic lambda expressions
lambda capture initializers
return type deduction
decltype(auto)
relaxing constraints on constexpr functions
variable templates
[[deprecated]] attribute
C++14 includes the following new library features:

user-defined literals for standard library types
compile-time integer sequences
std::make_unique

C++11 includes the following new language features:

move semantics
variadic templates
rvalue references
forwarding references
initializer lists
static assertions
auto
lambda expressions
decltype
type aliases
nullptr
strongly-typed enums
attributes
constexpr
delegating constructors
user-defined literals
explicit virtual overrides
final specifier
default functions
deleted functions
range-based for loops
special member functions for move semantics
converting constructors
explicit conversion functions
inline-namespaces
non-static data member initializers
right angle brackets
ref-qualified member functions
trailing return types
noexcept specifier
char32_t and char16_t
raw string literals

C++11 includes the following new library features:

std::move
std::forward
std::thread
std::to_string
type traits
smart pointers
std::chrono
tuples
std::tie
std::array
unordered containers
std::make_shared
std::ref
memory model
std::async
std::begin/end