jQuery provided a lot of quality-of-life functionality that is now part of the native Javascript language/runtime on modern browsers.

The most famous likely being the selector querying functionality, and the event management (and I'm sure others I am not thinking of).

jQuery still works, but under the hood it's just proxying those native methods, so you might as well just use those native methods directly.

With the advent of new frameworks like React (7 years old now) and Angular, jQuery has become less and less used. Anecdotally, I have interviewed at 7 or 8 companies over the last 7ish years and only one still used jQuery, and they were moving away from it.

Long time ago, even the creator of jQuery says don't use it.