How this String split()[1] method work

Question

I look at the String.Split() method in MSDN which is different from the above. can someone help to explain how this works?

string boundary = resp.Headers["Content-Type"].Split('=')[1]; 

What is that [1] beside the .Split('=')[1] means?

Answer 1

String.Split returns an array.

Writing x[1], where x is an array, gets the 2^nd element in the array.