How and when to use JavaScript arrow functions

JavaScript arrow functions, introduced in ES2015, offer a simpler syntax than standard functions. They inherit 'this' from the outer scope and can't be used as constructors or generators. Arrow functions support implicit returns for single-statement bodies and are useful for callbacks. However, they lack their own 'this' binding, 'arguments' object, and prototype property. They're best used for callbacks and array methods, but not for class constructors or methods requiring 'this' access.