jQuery is for adding behavior to web _pages_. It thrived in the era where most web development happened on the backend and frontend development was really about

jQuery is for adding behavior to web _pages_. It thrived in the era where most web development happened on the backend and frontend development was really about sprinkling interactivity and effects onto a page. jQuery does not supply powerful-enough abstractions for writing applications. Early attempts to layer MVC on top of jQuery did not meet with much success; Angular and other libraries used it initially for DOM manipulation but as time went on they mostly found ways to drop the dependency. I still think that if you're building _pages_ instead of an application, you should consider it. Plus, it is a great tool for understanding and manipulating the DOM. I think it will continue to be popular with casual web developers for a long time, although frontend engineers have probably not been using it for years. I think the death of jQuery is exaggerated, but only time will really tell.