What does 'is an instance of' mean in Javascript?

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The answer to this question: What is the initial value of a JavaScript function's prototype property?

has this sentence:

The initial value of prototype on any newly-created Function instance is a new instance of Object

As far as I know, Javascript doesn't have classes and the word 'instance' therefor doesn't make sense in my head. How should one interpret 'instance' in Javascript?

Sorry, I don't have enough rep to put my question in the comment thread on that answer.

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