this Keyword in Different Contexts

The value of 'this' is determined by: 1) How a function is called, not where it's defined, 2) The execution context at the time of invocation, 3) Different calling patterns result in different 'this' bindings, 4) Method invocation, constructor calls, and explicit binding affect 'this', 5) Default binding applies in non-strict mode global context, 6) Understanding call-site is crucial for predicting 'this' value.