According to MDN web docs, this keyword is a property of an execution context (global, function or eval) that, in non–strict mode, is always a reference to an object and in strict mode can be any value.

In most cases, the value of this is determined by how a function is called (runtime binding). It can’t be set by assignment during execution, and it may be different each time the function is called. ES5 introduced the bind() method to set the value of a function’s this regardless of how it’s called, and ES2015 introduced arrow functions which don’t provide their own this binding (it retains the this value of the enclosing lexical context).

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