What does "context" in "context-free grammar" refer to?

Question

There are lots of definitions online about what a Context-Free Grammar is, but nothing I find is satisfying my primary trouble:What *context* is it free of?To investigate, I Googled "context sensitive grammar" but I still failed to find what the "context" was all about.Can someone please explain what the `context` term refers to in these names?

Answer 1

If you are refering to formal-language theory, context-free grammar means a formal grammar whose production rules are generally applied to a nontermianl symbol irrespective of its context.