In the context of WordPress, jQuery is used to add interactivity and other dynamic elements to a WordPress website. WordPress includes a version of jQuery by default, which makes it easy for developers to add interactive elements to their sites without having to worry about downloading and integrating the library themselves.
For example, jQuery can be used to create sliders, lightboxes, accordions, and other interactive elements, as well as to handle form validation, add smooth scrolling effects, and much more. There are also many plugins available for WordPress that use jQuery to provide additional functionality, such as image galleries, social media sharing buttons, and more.
In addition to the core features of jQuery, WordPress also provides a number of functions and actions specifically for use with the library. These functions and actions can be used to extend and modify the behavior of jQuery in WordPress, making it possible to create custom solutions that are tailored to the needs of the site.