The Raku programming language is the sixth major revision ofPerl.
It was designed in order to tackle with the caveats that Perl had accumulated during its now long history. Those caveats were mainly due to a requirement ofbackward compatibility of successive versions of Perl. That's why Raku is the first version of Perl that isnot backward-compatible.
Raku does not replace Perl. It is rather a sister language or, as some like to put it, the R&D branch of Perl. To some degree, Raku is to Perl what C++ is to C. Although C++ is very successful programming language, it has not in any wayreplaced C.