Turing Complete Language
You can read the complicated explanation of what a Turing complete language is under Wikipedia.
An easier way to think about it is just that it is a complete language that you can program anything in. There is no limitation of what you can do with it.
Lua, C++, Java, Python, C#, C, Javascript are all “turing complete” language.
For more technical way of saying that read Wiki-pedia: