Introduction to jQuery
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The jQuery library was first released in August of 2006, and serve as a much needed bridge between browsers in the late 2000s. Its easy to use API and straight forward documentation made jQuery the dominate JavaScript tool on the web for nearly a decade.
Today, with the inconsistencies between browsers dramatically decreased and the increase capabilities of "vanilla" JavaScript, there is less of need for jQuery. Plus, with the rise of the full fledged JavaScript frameworks like, Angular, React and Vue, jQuery has fallen out of favor.
But, the jQuery legacy still lives on, and a large number of sites still rely on the jQuery for at least some of their functionality. So, while it is discouraged to use jQuery for new development, it is good idea to become familiar with the basic structure and syntax of jQuery.