How does generators work internally in JavaScript?

Generators in JavaScript are special functions that can pause and resume their execution at any point. They provide a simpler way to work with asynchronous programming and make it easier to manage sequences of values.

Internally, generators use the `function*` syntax to define a generator function. When called, a generator function does not execute its body immediately. Instead, it returns a generator object, which can be used to control the execution of the function. The `yield` keyword is used to pause execution and return a value to the caller. This allows the function to maintain its state between calls, making it possible to generate a series of values over time.