What is JQuery?
Javascript, JQuery

JQuery is a Javascript library for DOM operations whose variables, by convention, are usually preceded by the $ (dollar) sign. 

JQuery used to be essential to front-end development. The JQuery plug-in for AJAX support was crucial, for example. Many developers knew JQuery so well, that they didn't even learn many elements of Javascript. They just brought in the JQuery library and used its functions instead.

Today (2015) JQuery is becoming sort of deprecated. The JQuery registry itself is now set to read-only and suggests people use NPM instead.

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