jQuery 3.6.0 / 2.2.4 / 1.12.4

jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. jQuery was originally released in January 2006 at BarCamp NYC by John Resig and was influenced by Dean Edwards’ earlier cssQuery library.

jQuery also provides capabilities for developers to create plug-ins on top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets.The modular approach to the jQuery library allows the creation of powerful dynamic web pages and Web applications. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.

What is the difference between jQuery regular to jQuery slim build?

jQuery slim is a smaller package than the regular build, that exclude ajax and effects modules, resulting in a smaller size, about 6kb. You might won’t notice any performance improvements.