What the hell is a JRuby?

If you are like me and you don’t know your MRI from your RBX, you think a Truffle Ruby sounds delicious and panic when someone mentions JRuby, then this talk I gave at RubyConf AU 2019 is for you. We will delve into JRuby and figure out what it is, why it is and how it is different from ‘normal’ ruby and other alternative Ruby implementations.