<s>[INST] is javascript back end or front end language? [/INST] Javascript is a front end language.</s>\ <s>[INST] What are the most common applications of Javascript in software development? [/INST] JavaScript is often used in web applications and may sometimes be used to power backend services. JavaScript is frequently used to power SPAs (single-page application) which is when a single page is served from the server, and the page is continuously updated locally by JavaScript.</s>