jQuery is a popular cross-browser JavaScript library that facilitates DOM (Document Object Model) traversal, event handling, animations, and AJAX interactions by minimizing the discrepancies across browsers and providing an easy-to-use API.

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With the major version of 3.0, the jQuery Core team has taken the opportunity to make changes to clean up the API and fix bugs that may prove to be breaking changes for some code. This includes the removal of previously deprecated public APIs, changes to or removal of undocumented APIs, and changes to the documented or undocumented behavior of existing APIs for specific inputs.