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A Closure is a programming construct that combines a function (lambda or not) with its surrounding context, allowing the function to access Free Variables defined outside of it.
This means that a closure captures the values of these variables, enabling the function to be evaluated even after its original context has finished executing. While often confused with lambdas, a closure specifically refers to the environment that binds these free variables, making the expression self-contained and evaluable.
See more about this comparison in this Stack Overflow question: What is the difference between a ‘closure’ and a ‘lambda’?.