I have no idea what the difference between these are. I have heard that they have the same meaning, but how do they?

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    This is sort of a big thing. Can you narrow down with examples? Do you mean syntactically? Semantically? Connotations? Frequency/register? – Mitch Jan 13 '17 at 15:32
  • Try reading grammar.cl/Notes/Future_Will_vs_Going.htm – Hank Jan 13 '17 at 15:32
  • Welcome to English Language & Usage. You might want to take a look a these similiar posts on "going to vs. will". – Cascabel Jan 13 '17 at 15:32
  • Well, from what I understood, they have the same meaning, except that "going to" is planned – Beatriz Leme Jan 13 '17 at 15:40
  • No, there is no "planning" aspect here. However, we may be straying into deontic modes versus epistemic ones. – tchrist Jan 13 '17 at 15:42