A closure is a fundamental concept in JavaScript where an inner function retains access to the variables of its outer function even after the outer function has finished executing. This occurs because the inner function keeps a reference to its original lexical environment, effectively "remembering" the scope it was created in. How Closures Work: In JavaScript, closures are created every time a function is defined inside another function. ⇒ Lexical Scoping: JavaScript uses the physical location of a variable in the source code to determine its accessibility. Inner functions can look "up" the scope chain to find variables in outer functions. ⇒ Persistence: Normally, local variables within a function are destroyed once that function finishes running. However, if an inner function uses those variables, the JavaScript engine keeps them in memory as long as that inner function exists.…