Generators in JavaScript are a powerful feature  introduced in ES6. They are functions that can be paused and resumed during their execution, allowing for more complex control flows and lazy evaluation of data. Generators are denoted by an asterisk (*) after the function keyword. When a generator function is called, it returns an iterator object that can be used to control the function's execution. Generators are useful for scenarios where you need to handle sequences of data or control flow in a more sophisticated manner.