Comment by saghm

I think of closures as a bit orthogonal to that; the definition of "closure" that I'm used to is a function that "encloses" some data that is not an argument (somewhat like a function with free variables in lambda calculus), whereas a callback might only deal with its arguments. That being said, sometimes I see the term "closure" being used in a way that I associate with the word "lambda", which feels a bit off to me (I'm looking at you, Rust...)