jQuery callback - JavaScript statements are executed line by line. However, with effects, the next line of code can be run even though the effect is not finished. This can create errors. To prevent this, you can create a callback function. A callback function is executed after the current effect is finished.
jQuery chaining - With jQuery, you can chain together actions/methods. Chaining allows us to run multiple jQuery methods (on the same element) within a single statement.

jQuery is a fast, small, and feature-rich JavaScript library.The purpose of jQuery is to make it much easier to use JavaScript on your website.
Some features of jQuery library are as follows -
1. "Write less, do more"
2. Most widely used JS Library
3. Cross browser compatibilty
4. Open source and free to use
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