JavaScript (/ˈdʒɑːvəskrɪpt/), often abbreviated as JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. As of 2023, 98.7% of websites use JavaScript on the client side for webpage behavior, [10] often incorporating third-party libraries. All major web browsers have a dedicated JavaScript engine to execute the code on users' devices.