The spread operator is used to spread the elements of an iterable like object or array. For instance, if we wish to find the largest number in an array (say [ 4, 5, 6 ]), using Math.max([4, 5, 6]) will not yield the correct result as Math.max expects comma-separated inputs, and not an array. Here, to spread or separate the elements of the array, we can use the '...' operator this way: Math.max(...[4, 5, 6]) The rest operator, which looks the same as the spread operator, does quite the opposite of it. In the case of a function, for example, the rest operator can be used to combine all the arguments passed to the function into an array. Eg., function(...args) { // here args will be an array of all the arguments passed to the function }. Similarly, if we wish to separate out a property from an object and combine the others, we can use: const singleObject = { propertyOne: 1, propertyTwo: 2, propertyThree: 3} const {propertyOne, ...theOtherProperties} = singleObject; Here theOtherProperties will be an object containing propertyTwo, and propertyThree.