What are constructers and overloaded constructers?

Can someone tell me what a constructer and an overloaded constructer are?

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As for overloaded constructors: An overloaded function (in this case a constructor) is when you make multiple functions with the same name but which take different arguments. With constructors, this allows you to construct your objects in literally an infinite amount of ways (or until you get tired of typing... whichever comes first )