C++98 was the first edition of the C++ standard. It had defined all the basic language constructs, the STL, and the standard library.
C++03 was the next revision to this standard. This was majorly a considered a bugfix for the standard as it corrected 92 core language defect reports, 125 library defect reports, and included only one new language feature: value initialization.
C++0x was the name of the work in progress that was expected to complete by 2008-09 but finally completed in 2011.
C++11 was the modern C++ standard published in 2011. This brought many major extensions and improvements to the existing language. Following are the major features of C++11 −
And many more. You can get the complete list with examples at https://en.wikipedia.org/wiki/C%2B%2B11.